permanently mark Delivery processors on master/monitor/audition as immune to solo...
[ardour.git] / libs / ardour / session.cc
index 93293de2b63037a5ea53980be2cbc661e8a8c75f..90e58098906c2ee39c326e2d7604b06b51dacd26 100644 (file)
@@ -1,5 +1,5 @@
 /*
-    Copyright (C) 1999-2004 Paul Davis
+    Copyright (C) 1999-2010 Paul Davis
 
     This program is free software; you can redistribute it and/or modify
     it under the terms of the GNU General Public License as published by
 #include <unistd.h>
 #include <limits.h>
 
-#include <sigc++/bind.h>
-#include <sigc++/retype.h>
-
 #include <glibmm/thread.h>
 #include <glibmm/miscutils.h>
 #include <glibmm/fileutils.h>
 
 #include "pbd/error.h"
-#include <glibmm/thread.h>
 #include "pbd/boost_debug.h"
 #include "pbd/pathscanner.h"
 #include "pbd/stl_delete.h"
 #include "pbd/basename.h"
 #include "pbd/stacktrace.h"
 #include "pbd/file_utils.h"
+#include "pbd/convert.h"
 
 #include "ardour/amp.h"
 #include "ardour/analyser.h"
@@ -55,6 +52,7 @@
 #include "ardour/audioplaylist.h"
 #include "ardour/audioregion.h"
 #include "ardour/auditioner.h"
+#include "ardour/buffer_manager.h"
 #include "ardour/buffer_set.h"
 #include "ardour/bundle.h"
 #include "ardour/butler.h"
@@ -71,7 +69,9 @@
 #include "ardour/midi_playlist.h"
 #include "ardour/midi_region.h"
 #include "ardour/midi_track.h"
+#include "ardour/midi_ui.h"
 #include "ardour/named_selection.h"
+#include "ardour/process_thread.h"
 #include "ardour/playlist.h"
 #include "ardour/plugin_insert.h"
 #include "ardour/port_insert.h"
@@ -86,6 +86,7 @@
 #include "ardour/session_directory.h"
 #include "ardour/session_directory.h"
 #include "ardour/session_metadata.h"
+#include "ardour/session_playlists.h"
 #include "ardour/slave.h"
 #include "ardour/smf_source.h"
 #include "ardour/source_factory.h"
@@ -93,6 +94,8 @@
 #include "ardour/tempo.h"
 #include "ardour/utils.h"
 
+#include "midi++/jack.h"
+
 #include "i18n.h"
 
 using namespace std;
@@ -103,42 +106,41 @@ using boost::weak_ptr;
 
 bool Session::_disable_all_loaded_plugins = false;
 
-sigc::signal<void,std::string> Session::Dialog;
-sigc::signal<int> Session::AskAboutPendingState;
-sigc::signal<int,nframes_t,nframes_t> Session::AskAboutSampleRateMismatch;
-sigc::signal<void> Session::SendFeedback;
+PBD::Signal1<void,std::string> Session::Dialog;
+PBD::Signal0<int> Session::AskAboutPendingState;
+PBD::Signal2<int,nframes_t,nframes_t> Session::AskAboutSampleRateMismatch;
+PBD::Signal0<void> Session::SendFeedback;
+
+PBD::Signal0<void> Session::TimecodeOffsetChanged;
+PBD::Signal0<void> Session::StartTimeChanged;
+PBD::Signal0<void> Session::EndTimeChanged;
+PBD::Signal0<void> Session::AutoBindingOn;
+PBD::Signal0<void> Session::AutoBindingOff;
+PBD::Signal2<void,std::string, std::string> Session::Exported;
+PBD::Signal1<int,boost::shared_ptr<Playlist> > Session::AskAboutPlaylistDeletion;
 
-sigc::signal<void> Session::TimecodeOffsetChanged;
-sigc::signal<void> Session::StartTimeChanged;
-sigc::signal<void> Session::EndTimeChanged;
-sigc::signal<void> Session::AutoBindingOn;
-sigc::signal<void> Session::AutoBindingOff;
-sigc::signal<void, std::string, std::string> Session::Exported;
+static void clean_up_session_event (SessionEvent* ev) { delete ev; }
+const SessionEvent::RTeventCallback Session::rt_cleanup (clean_up_session_event);
 
 Session::Session (AudioEngine &eng,
                  const string& fullpath,
                  const string& snapshot_name,
+                  BusProfile* bus_profile,
                  string mix_template)
 
        : _engine (eng),
          _target_transport_speed (0.0),
          _requested_return_frame (-1),
-         _scratch_buffers(new BufferSet()),
-         _silent_buffers(new BufferSet()),
-         _mix_buffers(new BufferSet()),
          mmc (0),
          _mmc_port (default_mmc_port),
          _mtc_port (default_mtc_port),
          _midi_port (default_midi_port),
          _midi_clock_port (default_midi_clock_port),
          _session_dir (new SessionDirectory(fullpath)),
-         pending_events (2048),
          state_tree (0),
-         _butler (new Butler (this)),
+         _butler (new Butler (*this)),
          _post_transport_work (0),
          _send_timecode_update (false),
-         midi_thread (pthread_t (0)),
-         midi_requests (128), // the size of this should match the midi request pool size
          diskstreams (new DiskstreamList),
          routes (new RouteList),
          _total_free_4k_blocks (0),
@@ -152,31 +154,29 @@ Session::Session (AudioEngine &eng,
          _have_rec_enabled_diskstream (false)
 
 {
-       bool new_session;
-
+       playlists.reset (new SessionPlaylists);
+       
        interpolation.add_channel_to (0, 0);
 
        if (!eng.connected()) {
                throw failed_constructor();
        }
 
-       info << "Loading session " << fullpath << " using snapshot " << snapshot_name << " (1)" << endl;
-
        n_physical_outputs = _engine.n_physical_outputs(DataType::AUDIO);
        n_physical_inputs =  _engine.n_physical_inputs(DataType::AUDIO);
 
        first_stage_init (fullpath, snapshot_name);
 
-       new_session = !Glib::file_test (_path, Glib::FileTest (G_FILE_TEST_EXISTS | G_FILE_TEST_IS_DIR));
+        _is_new = !Glib::file_test (_path, Glib::FileTest (G_FILE_TEST_EXISTS | G_FILE_TEST_IS_DIR));
 
-       if (new_session) {
-               if (create (new_session, mix_template, compute_initial_length())) {
+       if (_is_new) {
+               if (create (mix_template, compute_initial_length(), bus_profile)) {
                        destroy ();
                        throw failed_constructor ();
                }
-       }
+        }
 
-       if (second_stage_init (new_session)) {
+       if (second_stage_init ()) {
                destroy ();
                throw failed_constructor ();
        }
@@ -187,141 +187,14 @@ Session::Session (AudioEngine &eng,
 
        _state_of_the_state = StateOfTheState (_state_of_the_state & ~Dirty);
 
-       Config->ParameterChanged.connect (bind (mem_fun (*this, &Session::config_changed), false));
-       config.ParameterChanged.connect (bind (mem_fun (*this, &Session::config_changed), true));
+       Config->ParameterChanged.connect_same_thread (*this, boost::bind (&Session::config_changed, this, _1, false));
+       config.ParameterChanged.connect_same_thread (*this, boost::bind (&Session::config_changed, this, _1, true));
 
        if (was_dirty) {
                DirtyChanged (); /* EMIT SIGNAL */
        }
-}
-
-Session::Session (AudioEngine &eng,
-                 string fullpath,
-                 string snapshot_name,
-                 AutoConnectOption input_ac,
-                 AutoConnectOption output_ac,
-                 uint32_t control_out_channels,
-                 uint32_t master_out_channels,
-                 uint32_t requested_physical_in,
-                 uint32_t requested_physical_out,
-                 nframes_t initial_length)
-
-       : _engine (eng),
-         _target_transport_speed (0.0),
-         _requested_return_frame (-1),
-         _scratch_buffers(new BufferSet()),
-         _silent_buffers(new BufferSet()),
-         _mix_buffers(new BufferSet()),
-         mmc (0),
-         _mmc_port (default_mmc_port),
-         _mtc_port (default_mtc_port),
-         _midi_port (default_midi_port),
-         _midi_clock_port (default_midi_clock_port),
-         _session_dir ( new SessionDirectory(fullpath)),
-         pending_events (2048),
-         state_tree (0),
-         _butler (new Butler (this)),
-         _post_transport_work (0),
-         _send_timecode_update (false),
-         midi_thread (pthread_t (0)),
-         midi_requests (16),
-         diskstreams (new DiskstreamList),
-         routes (new RouteList),
-         _total_free_4k_blocks (0),
-         _bundles (new BundleList),
-         _bundle_xml_node (0),
-         _click_io ((IO *) 0),
-         click_data (0),
-         click_emphasis_data (0),
-         main_outs (0),
-         _metadata (new SessionMetadata()),
-         _have_rec_enabled_diskstream (false)
-{
-       bool new_session;
-
-       interpolation.add_channel_to (0, 0);
-
-       if (!eng.connected()) {
-               throw failed_constructor();
-       }
-
-       info << "Loading session " << fullpath << " using snapshot " << snapshot_name << " (2)" << endl;
-
-       n_physical_outputs = _engine.n_physical_outputs (DataType::AUDIO);
-       n_physical_inputs = _engine.n_physical_inputs (DataType::AUDIO);
-
-       if (n_physical_inputs) {
-               n_physical_inputs = max (requested_physical_in, n_physical_inputs);
-       }
-
-       if (n_physical_outputs) {
-               n_physical_outputs = max (requested_physical_out, n_physical_outputs);
-       }
-
-       first_stage_init (fullpath, snapshot_name);
-
-       new_session = !g_file_test (_path.c_str(), GFileTest (G_FILE_TEST_EXISTS | G_FILE_TEST_IS_DIR));
-
-       if (new_session) {
-               if (create (new_session, string(), initial_length)) {
-                       destroy ();
-                       throw failed_constructor ();
-               }
-       }
-
-       {
-               /* set up Master Out and Control Out if necessary */
-
-               RouteList rl;
-               int control_id = 1;
-
-               if (master_out_channels) {
-                       ChanCount count(DataType::AUDIO, master_out_channels);
-                       shared_ptr<Route> r (new Route (*this, _("master"), Route::MasterOut, DataType::AUDIO));
-                       r->input()->ensure_io (count, false, this);
-                       r->output()->ensure_io (count, false, this);
-                       r->set_remote_control_id (control_id);
-
-                       rl.push_back (r);
-               } else {
-                       /* prohibit auto-connect to master, because there isn't one */
-                       output_ac = AutoConnectOption (output_ac & ~AutoConnectMaster);
-               }
-
-               if (control_out_channels) {
-                       ChanCount count(DataType::AUDIO, control_out_channels);
-                       shared_ptr<Route> r (new Route (*this, _("monitor"), Route::ControlOut, DataType::AUDIO));
-                       r->input()->ensure_io (count, false, this);
-                       r->output()->ensure_io (count, false, this);
-                       r->set_remote_control_id (control_id++);
-
-                       rl.push_back (r);
-               }
-
-               if (!rl.empty()) {
-                       add_routes (rl, false);
-               }
-
-       }
-
-       if (no_auto_connect()) {
-               input_ac = AutoConnectOption (0);
-               output_ac = AutoConnectOption (0);
-       }
-
-       Config->set_input_auto_connect (input_ac);
-       Config->set_output_auto_connect (output_ac);
-
-       if (second_stage_init (new_session)) {
-               destroy ();
-               throw failed_constructor ();
-       }
-
-       store_recent_sessions (_name, _path);
 
-       _state_of_the_state = StateOfTheState (_state_of_the_state & ~Dirty);
-
-       Config->ParameterChanged.connect (bind (mem_fun (*this, &Session::config_changed), false));
+        _is_new = false;
 }
 
 Session::~Session ()
@@ -344,12 +217,6 @@ Session::destroy ()
 
        _engine.remove_session ();
 
-       GoingAway (); /* EMIT SIGNAL */
-
-       /* do this */
-
-       notify_callbacks ();
-
        /* clear history so that no references to objects are held any more */
 
        _history.clear ();
@@ -362,8 +229,9 @@ Session::destroy ()
 
        Stateful::loading_state_version = 0;
 
-       _butler->terminate_thread ();
-       //terminate_midi_thread ();
+       _butler->drop_references ();
+       delete _butler;
+       delete midi_control_ui;
 
        if (click_data != default_click) {
                delete [] click_data;
@@ -375,10 +243,6 @@ Session::destroy ()
 
        clear_clicks ();
 
-       delete _scratch_buffers;
-       delete _silent_buffers;
-       delete _mix_buffers;
-
        /* clear out any pending dead wood from RCU managed objects */
 
        routes.flush ();
@@ -387,63 +251,16 @@ Session::destroy ()
        
        AudioDiskstream::free_working_buffers();
 
-       Route::SyncOrderKeys.clear();
-
-       DEBUG_TRACE (DEBUG::Destruction, "delete named selections\n");
-       for (NamedSelectionList::iterator i = named_selections.begin(); i != named_selections.end(); ) {
-               NamedSelectionList::iterator tmp;
-
-               tmp = i;
-               ++tmp;
-
-               delete *i;
-               i = tmp;
-       }
-
-       DEBUG_TRACE (DEBUG::Destruction, "delete used playlists\n");
-       for (PlaylistList::iterator i = playlists.begin(); i != playlists.end(); ) {
-               PlaylistList::iterator tmp;
-
-               tmp = i;
-               ++tmp;
-
-               DEBUG_TRACE(DEBUG::Destruction, string_compose ("Dropping for used playlist %1 ; pre-ref = %2\n", (*i)->name(), (*i).use_count()));
-               (*i)->drop_references ();
-               
-
-               i = tmp;
-       }
-
-       DEBUG_TRACE (DEBUG::Destruction, "delete unused playlists\n");
-       for (PlaylistList::iterator i = unused_playlists.begin(); i != unused_playlists.end(); ) {
-               PlaylistList::iterator tmp;
-
-               tmp = i;
-               ++tmp;
+       /* tell everyone who is still standing that we're about to die */
+       drop_references ();
 
-               DEBUG_TRACE(DEBUG::Destruction, string_compose ("Dropping for unused playlist %1 ; pre-ref = %2\n", (*i)->name(), (*i).use_count()));
-               (*i)->drop_references ();
+       /* tell everyone to drop references and delete objects as we go */
 
-               i = tmp;
-       }
-
-       playlists.clear ();
-       unused_playlists.clear ();
+       DEBUG_TRACE (DEBUG::Destruction, "delete named selections\n");
+       named_selections.clear ();
 
        DEBUG_TRACE (DEBUG::Destruction, "delete regions\n");
-       for (RegionList::iterator i = regions.begin(); i != regions.end(); ) {
-               RegionList::iterator tmp;
-
-               tmp = i;
-               ++tmp;
-               
-               DEBUG_TRACE(DEBUG::Destruction, string_compose ("Dropping for region %1 (%2); pre-ref = %2\n", i->second->name(), i->second.get(), i->second.use_count()));
-               i->second->drop_references ();
-               DEBUG_TRACE(DEBUG::Destruction, string_compose ("region post ref = %1\n", i->second.use_count()));
-               i = tmp;
-       }
-
-       regions.clear ();
+       RegionFactory::delete_all_regions ();
 
        DEBUG_TRACE (DEBUG::Destruction, "delete routes\n");
        
@@ -451,20 +268,24 @@ Session::destroy ()
 
        auditioner.reset ();
        _master_out.reset ();
-       _control_out.reset ();
+       _monitor_out.reset ();
 
        {
                RCUWriter<RouteList> writer (routes);
                boost::shared_ptr<RouteList> r = writer.get_copy ();
+
                for (RouteList::iterator i = r->begin(); i != r->end(); ++i) {
                        DEBUG_TRACE(DEBUG::Destruction, string_compose ("Dropping for route %1 ; pre-ref = %2\n", (*i)->name(), (*i).use_count()));
                        (*i)->drop_references ();
                }
+
                r->clear ();
                /* writer goes out of scope and updates master */
        }
        routes.flush ();
 
+       boost::shared_ptr<RouteList> r = routes.reader ();
+
        DEBUG_TRACE (DEBUG::Destruction, "delete diskstreams\n");
        {
                RCUWriter<DiskstreamList> dwriter (diskstreams);
@@ -473,28 +294,22 @@ Session::destroy ()
                        DEBUG_TRACE(DEBUG::Destruction, string_compose ("Dropping for diskstream %1 ; pre-ref = %2\n", (*i)->name(), (*i).use_count()));
                        (*i)->drop_references ();
                }
+
                dsl->clear ();
        }
        diskstreams.flush ();
 
        DEBUG_TRACE (DEBUG::Destruction, "delete sources\n");
-       for (SourceMap::iterator i = sources.begin(); i != sources.end(); ) {
-               SourceMap::iterator tmp;
-
-               tmp = i;
-               ++tmp;
-
+       for (SourceMap::iterator i = sources.begin(); i != sources.end(); ++i) {
                DEBUG_TRACE(DEBUG::Destruction, string_compose ("Dropping for source %1 ; pre-ref = %2\n", i->second->path(), i->second.use_count()));
                i->second->drop_references ();
-
-               i = tmp;
        }
 
        sources.clear ();
 
-
        DEBUG_TRACE (DEBUG::Destruction, "delete route groups\n");
        for (list<RouteGroup *>::iterator i = _route_groups.begin(); i != _route_groups.end(); ++i) {
+               
                delete *i;
        }
 
@@ -502,6 +317,9 @@ Session::destroy ()
 
        delete mmc;
 
+       /* not strictly necessary, but doing it here allows the shared_ptr debugging to work */
+       playlists.reset ();
+
        boost_debug_list_ptrs ();
 
        DEBUG_TRACE (DEBUG::Destruction, "Session::destroy() done\n");
@@ -537,11 +355,15 @@ Session::when_engine_running ()
 
        BootMessage (_("Using configuration"));
 
-       Config->map_parameters (bind (mem_fun (*this, &Session::config_changed), false));
+       boost::function<void (std::string)> ff (boost::bind (&Session::config_changed, this, _1, false));
+       boost::function<void (std::string)> ft (boost::bind (&Session::config_changed, this, _1, true));
+
+       Config->map_parameters (ff);
+       config.map_parameters (ft);
 
        /* every time we reconnect, recompute worst case output latencies */
 
-       _engine.Running.connect (mem_fun (*this, &Session::set_worst_io_latencies));
+       _engine.Running.connect_same_thread (*this, boost::bind (&Session::set_worst_io_latencies, this));
 
        if (synced_to_jack()) {
                _engine.transport_stop ();
@@ -685,9 +507,11 @@ Session::when_engine_running ()
 
        hookup_io ();
 
-       if (!no_auto_connect()) {
+       if (_is_new && !no_auto_connect()) {
+
+                /* don't connect the master bus outputs if there is a monitor bus */
 
-               if (_master_out && Config->get_auto_connect_standard_busses()) {
+               if (_master_out && Config->get_auto_connect_standard_busses() && !_monitor_out) {
 
                        /* if requested auto-connect the outputs to the first N physical ports.
                         */
@@ -708,7 +532,7 @@ Session::when_engine_running ()
                        }
                }
 
-               if (_control_out) {
+               if (_monitor_out) {
 
                        /* AUDIO ONLY as of june 29th 2009, because listen semantics for anything else
                           are undefined, at best.
@@ -718,16 +542,16 @@ Session::when_engine_running ()
                           under some conditions)
                        */
 
-                       uint32_t limit = _control_out->n_inputs().n_audio();
+                       uint32_t limit = _monitor_out->n_inputs().n_audio();
 
                        if (_master_out) {
                                for (uint32_t n = 0; n < limit; ++n) {
-                                       AudioPort* p = _control_out->input()->ports().nth_audio_port (n);
+                                       AudioPort* p = _monitor_out->input()->ports().nth_audio_port (n);
                                        AudioPort* o = _master_out->output()->ports().nth_audio_port (n);
 
                                        if (o) {
                                                string connect_to = o->name();
-                                               if (_control_out->input()->connect (p, connect_to, this)) {
+                                               if (_monitor_out->input()->connect (p, connect_to, this)) {
                                                        error << string_compose (_("cannot connect control input %1 to %2"), n, connect_to)
                                                              << endmsg;
                                                        break;
@@ -736,18 +560,17 @@ Session::when_engine_running ()
                                }
                        }
 
-                       /* if control out is not connected,
-                          connect control out to physical outs, but use ones after the master if possible
+                       /* if control out is not connected, connect control out to physical outs
                        */
 
-                       if (!_control_out->output()->connected_to (boost::shared_ptr<IO>())) {
+                       if (!_monitor_out->output()->connected ()) {
 
                                if (!Config->get_monitor_bus_preferred_bundle().empty()) {
 
                                        boost::shared_ptr<Bundle> b = bundle_by_name (Config->get_monitor_bus_preferred_bundle());
 
                                        if (b) {
-                                               _control_out->output()->connect_ports_to_bundle (b, this);
+                                               _monitor_out->output()->connect_ports_to_bundle (b, this);
                                        } else {
                                                warning << string_compose (_("The preferred I/O for the monitor bus (%1) cannot be found"),
                                                                           Config->get_monitor_bus_preferred_bundle())
@@ -755,25 +578,24 @@ Session::when_engine_running ()
                                        }
 
                                } else {
-
-                                       /* XXX this logic is wrong for mixed port types */
-
-                                       uint32_t shift = _master_out->n_outputs().n_audio();
-                                       uint32_t mod = _engine.n_physical_outputs (DataType::AUDIO);
-                                       limit = _control_out->n_outputs().n_audio();
-
-                                       cerr << "Connecting " << limit << " control out ports, shift is " << shift << " mod is " << mod << endl;
-
-                                       for (uint32_t n = 0; n < limit; ++n) {
-
-                                               Port* p = _control_out->output()->nth (n);
-                                               string connect_to = _engine.get_nth_physical_output (DataType (p->type()), (n+shift) % mod);
-
-                                               if (!connect_to.empty()) {
-                                                       if (_control_out->output()->connect (p, connect_to, this)) {
-                                                               error << string_compose (_("cannot connect control output %1 to %2"), n, connect_to)
-                                                                     << endmsg;
-                                                               break;
+                                        
+                                       for (DataType::iterator t = DataType::begin(); t != DataType::end(); ++t) {
+                                               uint32_t mod = _engine.n_physical_outputs (*t);
+                                               uint32_t limit = _monitor_out->n_outputs().get(*t);
+
+                                               for (uint32_t n = 0; n < limit; ++n) {
+
+                                                       Port* p = _monitor_out->output()->ports().port(*t, n);
+                                                       string connect_to = _engine.get_nth_physical_output (*t, (n % mod));
+
+                                                       if (!connect_to.empty()) {
+                                                               if (_monitor_out->output()->connect (p, connect_to, this)) {
+                                                                       error << string_compose (
+                                                                                       _("cannot connect control output %1 to %2"),
+                                                                                       n, connect_to)
+                                                                               << endmsg;
+                                                                       break;
+                                                               }
                                                        }
                                                }
                                        }
@@ -807,11 +629,16 @@ Session::hookup_io ()
 
                /* we delay creating the auditioner till now because
                   it makes its own connections to ports.
-                  the engine has to be running for this to work.
                */
 
                try {
-                       auditioner.reset (new Auditioner (*this));
+                        Auditioner* a = new Auditioner (*this);
+                        if (a->init()) {
+                                delete a;
+                                throw failed_constructor();
+                        }
+                        a->use_new_diskstream ();
+                       auditioner.reset (a);
                }
 
                catch (failed_constructor& err) {
@@ -828,28 +655,38 @@ Session::hookup_io ()
        /* Tell all IO objects to connect themselves together */
 
        IO::enable_connecting ();
+       MIDI::JACK_MidiPort::MakeConnections ();
 
        /* Now reset all panners */
 
        Delivery::reset_panners ();
 
-       /* Connect tracks to listen/solo etc. busses XXX generalize this beyond control_out */
-
-       if (_control_out) {
+       /* Connect tracks to monitor/listen bus if there is one.
+           Note that in an existing session, the internal sends will
+           already exist, but we want the routes to notice that
+           they connect to the control out specifically.
+         */
 
+        if (_monitor_out) {
                boost::shared_ptr<RouteList> r = routes.reader ();
-
-               for (RouteList::iterator x = r->begin(); x != r->end(); ++x) {
-
-                       if ((*x)->is_control() || (*x)->is_master()) {
-                               continue;
-                       }
-
-                       (*x)->listen_via (_control_out,
-                                         (Config->get_listen_position() == AfterFaderListen ? PostFader : PreFader),
-                                         false, false);
-               }
-       }
+                for (RouteList::iterator x = r->begin(); x != r->end(); ++x) {
+                        
+                        if ((*x)->is_monitor()) {
+                                
+                                /* relax */
+                                
+                        } else if ((*x)->is_master()) {
+                                
+                                /* relax */
+                                
+                        } else {
+                                
+                                (*x)->listen_via (_monitor_out,
+                                                  (Config->get_listen_position() == AfterFaderListen ? PostFader : PreFader),
+                                                  false, false);
+                        }
+                }
+        }
 
        /* Anyone who cares about input state, wake up and do something */
 
@@ -875,9 +712,9 @@ Session::hookup_io ()
 void
 Session::playlist_length_changed ()
 {
-       /* we can't just increase end_location->end() if pl->get_maximum_extent()
+       /* we can't just increase session_range_location->end() if pl->get_maximum_extent()
           if larger. if the playlist used to be the longest playlist,
-          and its now shorter, we have to decrease end_location->end(). hence,
+          and its now shorter, we have to decrease session_range_location->end(). hence,
           we have to iterate over all diskstreams and check the
           playlists currently in use.
        */
@@ -895,7 +732,7 @@ Session::diskstream_playlist_changed (boost::weak_ptr<Diskstream> wp)
        boost::shared_ptr<Playlist> playlist;
 
        if ((playlist = dstream->playlist()) != 0) {
-               playlist->LengthChanged.connect (mem_fun (this, &Session::playlist_length_changed));
+               playlist->LengthChanged.connect_same_thread (*this, boost::bind (&Session::playlist_length_changed, this));
        }
 
        /* see comment in playlist_length_changed () */
@@ -944,7 +781,7 @@ Session::reset_input_monitor_state ()
 void
 Session::auto_punch_start_changed (Location* location)
 {
-       replace_event (Event::PunchIn, location->start());
+       replace_event (SessionEvent::PunchIn, location->start());
 
        if (get_record_enabled() && config.get_punch_in()) {
                /* capture start has been changed, so save new pending state */
@@ -957,7 +794,7 @@ Session::auto_punch_end_changed (Location* location)
 {
        nframes_t when_to_stop = location->end();
        // when_to_stop += _worst_output_latency + _worst_input_latency;
-       replace_event (Event::PunchOut, when_to_stop);
+       replace_event (SessionEvent::PunchOut, when_to_stop);
 }
 
 void
@@ -965,15 +802,15 @@ Session::auto_punch_changed (Location* location)
 {
        nframes_t when_to_stop = location->end();
 
-       replace_event (Event::PunchIn, location->start());
+       replace_event (SessionEvent::PunchIn, location->start());
        //when_to_stop += _worst_output_latency + _worst_input_latency;
-       replace_event (Event::PunchOut, when_to_stop);
+       replace_event (SessionEvent::PunchOut, when_to_stop);
 }
 
 void
 Session::auto_loop_changed (Location* location)
 {
-       replace_event (Event::AutoLoop, location->end(), location->start());
+       replace_event (SessionEvent::AutoLoop, location->end(), location->start());
 
        if (transport_rolling() && play_loop) {
 
@@ -982,7 +819,7 @@ Session::auto_loop_changed (Location* location)
 
                if (_transport_frame < location->start() || _transport_frame > location->end()) {
                        // relocate to beginning of loop
-                       clear_events (Event::LocateRoll);
+                       clear_events (SessionEvent::LocateRoll);
 
                        request_locate (location->start(), true);
 
@@ -994,8 +831,8 @@ Session::auto_loop_changed (Location* location)
                        loop_changing = true;
 
                        if (location->end() > last_loopend) {
-                               clear_events (Event::LocateRoll);
-                               Event *ev = new Event (Event::LocateRoll, Event::Add, last_loopend, last_loopend, 0, true);
+                               clear_events (SessionEvent::LocateRoll);
+                               SessionEvent *ev = new SessionEvent (SessionEvent::LocateRoll, SessionEvent::Add, last_loopend, last_loopend, 0, true);
                                queue_event (ev);
                        }
 
@@ -1011,12 +848,10 @@ Session::set_auto_punch_location (Location* location)
        Location* existing;
 
        if ((existing = _locations.auto_punch_location()) != 0 && existing != location) {
-               auto_punch_start_changed_connection.disconnect();
-               auto_punch_end_changed_connection.disconnect();
-               auto_punch_changed_connection.disconnect();
+               punch_connections.drop_connections();
                existing->set_auto_punch (false, this);
-               remove_event (existing->start(), Event::PunchIn);
-               clear_events (Event::PunchOut);
+               remove_event (existing->start(), SessionEvent::PunchIn);
+               clear_events (SessionEvent::PunchOut);
                auto_punch_location_changed (0);
        }
 
@@ -1031,17 +866,14 @@ Session::set_auto_punch_location (Location* location)
                return;
        }
 
-       auto_punch_start_changed_connection.disconnect();
-       auto_punch_end_changed_connection.disconnect();
-       auto_punch_changed_connection.disconnect();
+       punch_connections.drop_connections ();
 
-       auto_punch_start_changed_connection = location->start_changed.connect (mem_fun (this, &Session::auto_punch_start_changed));
-       auto_punch_end_changed_connection = location->end_changed.connect (mem_fun (this, &Session::auto_punch_end_changed));
-       auto_punch_changed_connection = location->changed.connect (mem_fun (this, &Session::auto_punch_changed));
+       location->start_changed.connect_same_thread (punch_connections, boost::bind (&Session::auto_punch_start_changed, this, _1));
+       location->end_changed.connect_same_thread (punch_connections, boost::bind (&Session::auto_punch_end_changed, this, _1));
+       location->changed.connect_same_thread (punch_connections, boost::bind (&Session::auto_punch_changed, this, _1));
 
        location->set_auto_punch (true, this);
 
-
        auto_punch_changed (location);
 
        auto_punch_location_changed (location);
@@ -1053,11 +885,9 @@ Session::set_auto_loop_location (Location* location)
        Location* existing;
 
        if ((existing = _locations.auto_loop_location()) != 0 && existing != location) {
-               auto_loop_start_changed_connection.disconnect();
-               auto_loop_end_changed_connection.disconnect();
-               auto_loop_changed_connection.disconnect();
+               loop_connections.drop_connections ();
                existing->set_auto_loop (false, this);
-               remove_event (existing->end(), Event::AutoLoop);
+               remove_event (existing->end(), SessionEvent::AutoLoop);
                auto_loop_location_changed (0);
        }
 
@@ -1074,16 +904,11 @@ Session::set_auto_loop_location (Location* location)
 
        last_loopend = location->end();
 
-       auto_loop_start_changed_connection.disconnect();
-       auto_loop_end_changed_connection.disconnect();
-       auto_loop_changed_connection.disconnect();
+       loop_connections.drop_connections ();
 
-       auto_loop_start_changed_connection = location->start_changed.connect (
-                       mem_fun (this, &Session::auto_loop_changed));
-       auto_loop_end_changed_connection = location->end_changed.connect (
-                       mem_fun (this, &Session::auto_loop_changed));
-       auto_loop_changed_connection = location->changed.connect (
-                       mem_fun (this, &Session::auto_loop_changed));
+       location->start_changed.connect_same_thread (loop_connections, boost::bind (&Session::auto_loop_changed, this, _1));
+       location->end_changed.connect_same_thread (loop_connections, boost::bind (&Session::auto_loop_changed, this, _1));
+       location->changed.connect_same_thread (loop_connections, boost::bind (&Session::auto_loop_changed, this, _1));
 
        location->set_auto_loop (true, this);
 
@@ -1129,11 +954,8 @@ Session::handle_locations_changed (Locations::LocationList& locations)
                        set_loop = true;
                }
 
-               if (location->is_start()) {
-                       start_location = location;
-               }
-               if (location->is_end()) {
-                       end_location = location;
+               if (location->is_session_range()) {
+                       _session_range_location = location;
                }
        }
 
@@ -1187,8 +1009,9 @@ Session::disable_record (bool rt_context, bool force)
                // FIXME: timestamp correct? [DR]
                // FIXME FIXME FIXME: rt_context?  this must be called in the process thread.
                // does this /need/ to be sent in all cases?
-               if (rt_context)
+               if (rt_context) {
                        deliver_mmc (MIDI::MachineControl::cmdRecordExit, _transport_frame);
+               }
 
                if (Config->get_monitoring_model() == HardwareMonitoring && config.get_auto_input()) {
                        boost::shared_ptr<DiskstreamList> dsl = diskstreams.reader();
@@ -1211,9 +1034,7 @@ Session::disable_record (bool rt_context, bool force)
 void
 Session::step_back_from_record ()
 {
-       /* XXX really atomic compare+swap here */
-       if (g_atomic_int_get (&_record_status) == Recording) {
-               g_atomic_int_set (&_record_status, Enabled);
+       if (g_atomic_int_compare_and_exchange (&_record_status, Recording, Enabled)) {
 
                if (Config->get_monitoring_model() == HardwareMonitoring && config.get_auto_input()) {
                        boost::shared_ptr<DiskstreamList> dsl = diskstreams.reader();
@@ -1365,12 +1186,7 @@ Session::set_block_size (nframes_t nframes)
        {
                current_block_size = nframes;
 
-               ensure_buffers(_scratch_buffers->available());
-
-               delete [] _gain_automation_buffer;
-               _gain_automation_buffer = new gain_t[nframes];
-
-               allocate_pan_automation_buffers (nframes, _npan_buffers, true);
+               ensure_buffers ();
 
                boost::shared_ptr<RouteList> r = routes.reader ();
 
@@ -1562,66 +1378,82 @@ Session::resort_routes_using (shared_ptr<RouteList> r)
 
 }
 
-list<boost::shared_ptr<MidiTrack> >
-Session::new_midi_track (TrackMode mode, RouteGroup* route_group, uint32_t how_many)
+/** Find the route name starting with \a base with the lowest \a id.
+ *
+ * Names are constructed like e.g. "Audio 3" for base="Audio" and id=3.
+ * The available route name with the lowest ID will be used, and \a id
+ * will be set to the ID.
+ *
+ * \return false if a route name could not be found, and \a track_name
+ * and \a id do not reflect a free route name.
+ */
+bool
+Session::find_route_name (const char* base, uint32_t& id, char* name, size_t name_len)
 {
-       char track_name[32];
-       uint32_t track_id = 0;
-       uint32_t n = 0;
-       string port;
-       RouteList new_routes;
-       list<boost::shared_ptr<MidiTrack> > ret;
-       //uint32_t control_id;
+       do {
+               snprintf (name, name_len, "%s %" PRIu32, base, id);
 
-       // FIXME: need physical I/O and autoconnect stuff for MIDI
+               if (route_by_name (name) == 0) {
+                       return true;
+               }
 
-       /* count existing midi tracks */
+               ++id;
 
-       {
-               shared_ptr<RouteList> r = routes.reader ();
+       } while (id < (UINT_MAX-1));
 
-               for (RouteList::iterator i = r->begin(); i != r->end(); ++i) {
-                       if (boost::dynamic_pointer_cast<MidiTrack>(*i) != 0) {
-                               if (!(*i)->is_hidden()) {
-                                       n++;
-                                       //channels_used += (*i)->n_inputs().n_midi();
-                               }
-                       }
+       return false;
+}
+
+void
+Session::count_existing_route_channels (ChanCount& in, ChanCount& out)
+{
+       in  = ChanCount::ZERO;
+       out = ChanCount::ZERO;
+       shared_ptr<RouteList> r = routes.reader ();
+       for (RouteList::iterator i = r->begin(); i != r->end(); ++i) {
+               if (!(*i)->is_hidden()) {
+                       in += (*i)->n_inputs();
+                       out     += (*i)->n_outputs();
                }
        }
+}
 
-       vector<string> physinputs;
-       vector<string> physoutputs;
+list<boost::shared_ptr<MidiTrack> >
+Session::new_midi_track (TrackMode mode, RouteGroup* route_group, uint32_t how_many)
+{
+       char track_name[32];
+       uint32_t track_id = 0;
+       ChanCount existing_inputs;
+       ChanCount existing_outputs;
+       string port;
+       RouteList new_routes;
+       list<boost::shared_ptr<MidiTrack> > ret;
+       uint32_t control_id;
 
-       _engine.get_physical_outputs (DataType::MIDI, physoutputs);
-       _engine.get_physical_inputs (DataType::MIDI, physinputs);
+       count_existing_route_channels (existing_inputs, existing_outputs);
 
-       // control_id = ntracks() + nbusses();
+       control_id = ntracks() + nbusses();
 
        while (how_many) {
+               if (!find_route_name ("Midi", ++track_id, track_name, sizeof(track_name))) {
+                       error << "cannot find name for new midi track" << endmsg;
+                       goto failed;
+               }
 
-               /* check for duplicate route names, since we might have pre-existing
-                  routes with this name (e.g. create Audio1, Audio2, delete Audio1,
-                  save, close,restart,add new route - first named route is now
-                  Audio2)
-               */
-
-
-               do {
-                       ++track_id;
-
-                       snprintf (track_name, sizeof(track_name), "Midi %" PRIu32, track_id);
+               shared_ptr<MidiTrack> track;
 
-                       if (route_by_name (track_name) == 0) {
-                               break;
-                       }
+               try {
+                       MidiTrack* mt = new MidiTrack (*this, track_name, Route::Flag (0), mode);
 
-               } while (track_id < (UINT_MAX-1));
+                        if (mt->init ()) {
+                                delete mt;
+                                goto failed;
+                        }
 
-               shared_ptr<MidiTrack> track;
+                        mt->use_new_diskstream();
 
-               try {
-                       track = boost::shared_ptr<MidiTrack>((new MidiTrack (*this, track_name, Route::Flag (0), mode)));
+                       boost_debug_shared_ptr_mark_interesting (mt, "Track");
+                       track = boost::shared_ptr<MidiTrack>(mt);
 
                        if (track->input()->ensure_io (ChanCount(DataType::MIDI, 1), false, this)) {
                                error << "cannot configure 1 in/1 out configuration for new midi track" << endmsg;
@@ -1634,48 +1466,15 @@ Session::new_midi_track (TrackMode mode, RouteGroup* route_group, uint32_t how_m
                                goto failed;
                        }
 
-                       /*
-                       if (nphysical_in) {
-                               for (uint32_t x = 0; x < track->n_inputs().n_midi() && x < nphysical_in; ++x) {
-
-                                       port = "";
-
-                                       if (Config->get_input_auto_connect() & AutoConnectPhysical) {
-                                               port = physinputs[(channels_used+x)%nphysical_in];
-                                       }
-
-                                       if (port.length() && track->connect_input (track->input (x), port, this)) {
-                                               break;
-                                       }
-                               }
-                       }
-
-                       for (uint32_t x = 0; x < track->n_outputs().n_midi(); ++x) {
-
-                               port = "";
-
-                               if (nphysical_out && (Config->get_output_auto_connect() & AutoConnectPhysical)) {
-                                       port = physoutputs[(channels_used+x)%nphysical_out];
-                               } else if (Config->get_output_auto_connect() & AutoConnectMaster) {
-                                       if (_master_out) {
-                                               port = _master_out->input (x%_master_out->n_inputs().n_midi())->name();
-                                       }
-                               }
-
-                               if (port.length() && track->connect_output (track->output (x), port, this)) {
-                                       break;
-                               }
-                       }
-
-                       channels_used += track->n_inputs ().n_midi();
-
-                       */
+                       auto_connect_route (track, existing_inputs, existing_outputs);
 
                        track->midi_diskstream()->non_realtime_input_change();
-                       track->set_route_group (route_group, 0);
+                       if (route_group) {
+                               route_group->add (track);
+                       }
 
-                       track->DiskstreamChanged.connect (mem_fun (this, &Session::resort_routes));
-                       //track->set_remote_control_id (control_id);
+                       track->DiskstreamChanged.connect_same_thread (*this, boost::bind (&Session::resort_routes, this));
+                       track->set_remote_control_id (control_id);
 
                        new_routes.push_back (track);
                        ret.push_back (track);
@@ -1700,7 +1499,7 @@ Session::new_midi_track (TrackMode mode, RouteGroup* route_group, uint32_t how_m
 
                catch (AudioEngine::PortRegistrationFailure& pfe) {
 
-                       error << _("No more JACK ports are available. You will need to stop Ardour and restart JACK with ports if you need this many tracks.") << endmsg;
+                       error << string_compose (_("No more JACK ports are available. You will need to stop %1 and restart JACK with ports if you need this many tracks."), PROGRAM_NAME) << endmsg;
 
                        if (track) {
                                /* we need to get rid of this, since the track failed to be created */
@@ -1728,126 +1527,143 @@ Session::new_midi_track (TrackMode mode, RouteGroup* route_group, uint32_t how_m
        return ret;
 }
 
-list<boost::shared_ptr<AudioTrack> >
-Session::new_audio_track (int input_channels, int output_channels, TrackMode mode, RouteGroup* route_group,  uint32_t how_many)
+void
+Session::auto_connect_route (boost::shared_ptr<Route> route,
+               ChanCount& existing_inputs, ChanCount& existing_outputs)
 {
-       char track_name[32];
-       uint32_t track_id = 0;
-       uint32_t n = 0;
-       uint32_t channels_used = 0;
-       string port;
-       RouteList new_routes;
-       list<boost::shared_ptr<AudioTrack> > ret;
-       uint32_t control_id;
+       /* If both inputs and outputs are auto-connected to physical ports,
+          use the max of input and output offsets to ensure auto-connected
+          port numbers always match up (e.g. the first audio input and the
+          first audio output of the route will have the same physical
+          port number).  Otherwise just use the lowest input or output
+          offset possible.
+       */
+       const bool in_out_physical =
+                  (Config->get_input_auto_connect() & AutoConnectPhysical)
+               && (Config->get_output_auto_connect() & AutoConnectPhysical);
 
-       /* count existing audio tracks */
+       const ChanCount in_offset = in_out_physical
+               ? ChanCount::max(existing_inputs, existing_outputs)
+               : existing_inputs;
 
-       {
-               shared_ptr<RouteList> r = routes.reader ();
+       const ChanCount out_offset = in_out_physical
+               ? ChanCount::max(existing_inputs, existing_outputs)
+               : existing_outputs;
 
-               for (RouteList::iterator i = r->begin(); i != r->end(); ++i) {
-                       if (boost::dynamic_pointer_cast<AudioTrack>(*i) != 0) {
-                               if (!(*i)->is_hidden()) {
-                                       n++;
-                                       channels_used += (*i)->n_inputs().n_audio();
+       static string empty_string;
+       string& port = empty_string;
+
+       for (DataType::iterator t = DataType::begin(); t != DataType::end(); ++t) {
+               vector<string> physinputs;
+               vector<string> physoutputs;
+
+               _engine.get_physical_outputs (*t, physoutputs);
+               _engine.get_physical_inputs (*t, physinputs);
+
+               if (!physinputs.empty()) {
+                       uint32_t nphysical_in = physinputs.size();
+                       for (uint32_t i = 0; i < route->n_inputs().get(*t) && i < nphysical_in; ++i) {
+                               port = empty_string;
+
+                               if (Config->get_input_auto_connect() & AutoConnectPhysical) {
+                                       port = physinputs[(in_offset.get(*t) + i) % nphysical_in];
+                               }
+
+                               if (!port.empty() && route->input()->connect (
+                                               route->input()->ports().port(*t, i), port, this)) {
+                                       break;
                                }
                        }
                }
-       }
-
-       vector<string> physinputs;
-       vector<string> physoutputs;
 
-       _engine.get_physical_outputs (DataType::AUDIO, physoutputs);
-       _engine.get_physical_inputs (DataType::AUDIO, physinputs);
+               if (!physoutputs.empty()) {
+                       uint32_t nphysical_out = physoutputs.size();
+                       for (uint32_t i = 0; i < route->n_outputs().get(*t); ++i) {
+                               port = empty_string;
 
-       control_id = ntracks() + nbusses() + 1;
-
-       while (how_many) {
+                               if (Config->get_output_auto_connect() & AutoConnectPhysical) {
+                                       port = physoutputs[(out_offset.get(*t) + i) % nphysical_out];
+                               } else if (Config->get_output_auto_connect() & AutoConnectMaster) {
+                                       if (_master_out && _master_out->n_inputs().get(*t) > 0) {
+                                               port = _master_out->input()->ports().port(*t,
+                                                               i % _master_out->input()->n_ports().get(*t))->name();
+                                       }
+                               }
 
-               /* check for duplicate route names, since we might have pre-existing
-                  routes with this name (e.g. create Audio1, Audio2, delete Audio1,
-                  save, close,restart,add new route - first named route is now
-                  Audio2)
-               */
+                               if (!port.empty() && route->output()->connect (
+                                               route->output()->ports().port(*t, i), port, this)) {
+                                       break;
+                               }
+                       }
+               }
+       }
 
+       existing_inputs += route->n_inputs();
+       existing_outputs += route->n_outputs();
+}
 
-               do {
-                       ++track_id;
+list< boost::shared_ptr<AudioTrack> >
+Session::new_audio_track (int input_channels, int output_channels, TrackMode mode, RouteGroup* route_group, uint32_t how_many)
+{
+       char track_name[32];
+       uint32_t track_id = 0;
+       ChanCount existing_inputs;
+       ChanCount existing_outputs;
+       string port;
+       RouteList new_routes;
+       list<boost::shared_ptr<AudioTrack> > ret;
+       uint32_t control_id;
 
-                       snprintf (track_name, sizeof(track_name), "Audio %" PRIu32, track_id);
+       count_existing_route_channels (existing_inputs, existing_outputs);
 
-                       if (route_by_name (track_name) == 0) {
-                               break;
-                       }
+       control_id = ntracks() + nbusses() + 1;
 
-               } while (track_id < (UINT_MAX-1));
+       while (how_many) {
+               if (!find_route_name ("Audio", ++track_id, track_name, sizeof(track_name))) {
+                       error << "cannot find name for new audio track" << endmsg;
+                       goto failed;
+               }
 
                shared_ptr<AudioTrack> track;
 
                try {
                        AudioTrack* at = new AudioTrack (*this, track_name, Route::Flag (0), mode);
-                       // boost_debug_shared_ptr_mark_interesting (at, typeid (at).name());
-                       track = boost::shared_ptr<AudioTrack>(at);
+
+                        if (at->init ()) {
+                                delete at;
+                                goto failed;
+                        }
+
+                        at->use_new_diskstream();
+
+                       boost_debug_shared_ptr_mark_interesting (at, "Track");
+                       track = boost::shared_ptr<AudioTrack>(at);
 
                        if (track->input()->ensure_io (ChanCount(DataType::AUDIO, input_channels), false, this)) {
-                               error << string_compose (_("cannot configure %1 in/%2 out configuration for new audio track"),
+                               error << string_compose (
+                                                       _("cannot configure %1 in/%2 out configuration for new audio track"),
                                                         input_channels, output_channels)
                                      << endmsg;
                                goto failed;
                        }
 
                        if (track->output()->ensure_io (ChanCount(DataType::AUDIO, output_channels), false, this)) {
-                               error << string_compose (_("cannot configure %1 in/%2 out configuration for new audio track"),
+                               error << string_compose (
+                                                       _("cannot configure %1 in/%2 out configuration for new audio track"),
                                                         input_channels, output_channels)
                                      << endmsg;
                                goto failed;
                        }
 
-                       if (!physinputs.empty()) {
-                               uint32_t nphysical_in = physinputs.size();
-
-                               for (uint32_t x = 0; x < track->n_inputs().n_audio() && x < nphysical_in; ++x) {
+                       auto_connect_route (track, existing_inputs, existing_outputs);
 
-                                       port = "";
-
-                                       if (Config->get_input_auto_connect() & AutoConnectPhysical) {
-                                               port = physinputs[(channels_used+x)%nphysical_in];
-                                       }
-
-                                       if (port.length() && track->input()->connect (track->input()->nth(x), port, this)) {
-                                               break;
-                                       }
-                               }
+                       if (route_group) {
+                               route_group->add (track);
                        }
 
-                       if (!physoutputs.empty()) {
-                               uint32_t nphysical_out = physoutputs.size();
-
-                               for (uint32_t x = 0; x < track->n_outputs().n_audio(); ++x) {
-                                       port = "";
-
-                                       if (Config->get_output_auto_connect() & AutoConnectPhysical) {
-                                               port = physoutputs[(channels_used+x)%nphysical_out];
-                                       } else if (Config->get_output_auto_connect() & AutoConnectMaster) {
-                                               if (_master_out && _master_out->n_inputs().n_audio() > 0) {
-                                                       port = _master_out->input()->nth (x % _master_out->input()->n_ports().n_audio())->name();
-                                               }
-                                       }
-
-                                       if (port.length() && track->output()->connect (track->output()->nth(x), port, this)) {
-                                               break;
-                                       }
-                               }
-                       }
-
-                       channels_used += track->n_inputs ().n_audio();
-
-                       track->set_route_group (route_group, 0);
-
                        track->audio_diskstream()->non_realtime_input_change();
 
-                       track->DiskstreamChanged.connect (mem_fun (this, &Session::resort_routes));
+                       track->DiskstreamChanged.connect_same_thread (*this, boost::bind (&Session::resort_routes, this));
                        track->set_remote_control_id (control_id);
                        ++control_id;
 
@@ -1905,20 +1721,27 @@ void
 Session::set_remote_control_ids ()
 {
        RemoteModel m = Config->get_remote_model();
+       bool emit_signal = false;
 
        shared_ptr<RouteList> r = routes.reader ();
 
        for (RouteList::iterator i = r->begin(); i != r->end(); ++i) {
-               if ( MixerOrdered == m) {
+               if (MixerOrdered == m) {
                        long order = (*i)->order_key(N_("signal"));
-                       (*i)->set_remote_control_id( order+1 );
-               } else if ( EditorOrdered == m) {
+                       (*i)->set_remote_control_id (order+1, false);
+                       emit_signal = true;
+               } else if (EditorOrdered == m) {
                        long order = (*i)->order_key(N_("editor"));
-                       (*i)->set_remote_control_id( order+1 );
-               } else if ( UserOrdered == m) {
+                       (*i)->set_remote_control_id (order+1, false);
+                       emit_signal = true;
+               } else if (UserOrdered == m) {
                        //do nothing ... only changes to remote id's are initiated by user
                }
        }
+
+       if (emit_signal) {
+               Route::RemoteControlIDChange();
+       }
 }
 
 
@@ -1926,56 +1749,33 @@ RouteList
 Session::new_audio_route (bool aux, int input_channels, int output_channels, RouteGroup* route_group, uint32_t how_many)
 {
        char bus_name[32];
-       uint32_t bus_id = 1;
-       uint32_t n = 0;
-       uint32_t channels_used = 0;
+       uint32_t bus_id = 0;
+       ChanCount existing_inputs;
+       ChanCount existing_outputs;
        string port;
        RouteList ret;
        uint32_t control_id;
 
-       /* count existing audio busses */
-
-       {
-               shared_ptr<RouteList> r = routes.reader ();
-
-               for (RouteList::iterator i = r->begin(); i != r->end(); ++i) {
-                       if (boost::dynamic_pointer_cast<Track>(*i) == 0) {
-                               /* its a bus ? */
-                               if (!(*i)->is_hidden() && (*i)->name() != _("master")) {
-                                       bus_id++;
-                                       n++;
-                                       channels_used += (*i)->n_inputs().n_audio();
-                               }
-                       }
-               }
-       }
-
-       vector<string> physinputs;
-       vector<string> physoutputs;
-
-       _engine.get_physical_outputs (DataType::AUDIO, physoutputs);
-       _engine.get_physical_inputs (DataType::AUDIO, physinputs);
-
-       n_physical_audio_outputs = physoutputs.size();
-       n_physical_audio_inputs = physinputs.size();
+       count_existing_route_channels (existing_inputs, existing_outputs);
 
        control_id = ntracks() + nbusses() + 1;
 
        while (how_many) {
+               if (!find_route_name ("Bus", ++bus_id, bus_name, sizeof(bus_name))) {
+                       error << "cannot find name for new audio bus" << endmsg;
+                       goto failure;
+               }
 
-               do {
-                       snprintf (bus_name, sizeof(bus_name), "Bus %" PRIu32, bus_id);
-
-                       bus_id++;
-
-                       if (route_by_name (bus_name) == 0) {
-                               break;
-                       }
+               try {
+                       Route* rt = new Route (*this, bus_name, Route::Flag(0), DataType::AUDIO);
 
-               } while (bus_id < (UINT_MAX-1));
+                        if (rt->init ()) {
+                                delete rt;
+                                goto failure;
+                        }
 
-               try {
-                       shared_ptr<Route> bus (new Route (*this, bus_name, Route::Flag(0), DataType::AUDIO));
+                       boost_debug_shared_ptr_mark_interesting (rt, "Route");
+                       shared_ptr<Route> bus (rt);
 
                        if (bus->input()->ensure_io (ChanCount(DataType::AUDIO, input_channels), false, this)) {
                                error << string_compose (_("cannot configure %1 in/%2 out configuration for new audio track"),
@@ -1992,37 +1792,11 @@ Session::new_audio_route (bool aux, int input_channels, int output_channels, Rou
                                goto failure;
                        }
 
-                       for (uint32_t x = 0; n_physical_audio_inputs && x < bus->input()->n_ports().n_audio(); ++x) {
-                               port = "";
-
-                               if (Config->get_input_auto_connect() & AutoConnectPhysical) {
-                                       port = physinputs[((n+x)%n_physical_audio_inputs)];
-                               }
+                       auto_connect_route (bus, existing_inputs, existing_outputs);
 
-                               if (port.length() && bus->input()->connect (bus->input()->nth (x), port, this)) {
-                                       break;
-                               }
-                       }
-
-                       for (uint32_t x = 0; n_physical_audio_outputs && x < bus->n_outputs().n_audio(); ++x) {
-                               port = "";
-
-                               if (Config->get_output_auto_connect() & AutoConnectPhysical) {
-                                       port = physoutputs[((n+x)%n_physical_outputs)];
-                               } else if (Config->get_output_auto_connect() & AutoConnectMaster) {
-                                       if (_master_out) {
-                                               port = _master_out->input()->nth (x%_master_out->input()->n_ports().n_audio())->name();
-                                       }
-                               }
-
-                               if (port.length() && bus->output()->connect (bus->output()->nth(x), port, this)) {
-                                       break;
-                               }
+                       if (route_group) {
+                               route_group->add (bus);
                        }
-
-                       channels_used += bus->n_inputs ().n_audio();
-
-                       bus->set_route_group (route_group, 0);
                        bus->set_remote_control_id (control_id);
                        ++control_id;
 
@@ -2064,7 +1838,7 @@ Session::new_route_from_template (uint32_t how_many, const std::string& template
        RouteList ret;
        uint32_t control_id;
        XMLTree tree;
-       uint32_t number = 1;
+       uint32_t number = 0;
 
        if (!tree.read (template_path.c_str())) {
                return ret;
@@ -2081,19 +1855,7 @@ Session::new_route_from_template (uint32_t how_many, const std::string& template
                std::string node_name = IO::name_from_state (*node_copy.children().front());
 
                /* generate a new name by adding a number to the end of the template name */
-
-               do {
-                       snprintf (name, sizeof (name), "%s %" PRIu32, node_name.c_str(), number);
-
-                       number++;
-
-                       if (route_by_name (name) == 0) {
-                               break;
-                       }
-
-               } while (number < UINT_MAX);
-
-               if (number == UINT_MAX) {
+               if (!find_route_name (node_name.c_str(), ++number, name, sizeof(name))) {
                        fatal << _("Session: UINT_MAX routes? impossible!") << endmsg;
                        /*NOTREACHED*/
                }
@@ -2161,7 +1923,7 @@ Session::add_routes (RouteList& new_routes, bool save)
                   we will resort when done.
                */
 
-               if (!_control_out && IO::connecting_legal) {
+               if (!_monitor_out && IO::connecting_legal) {
                        resort_routes_using (r);
                }
        }
@@ -2169,32 +1931,36 @@ Session::add_routes (RouteList& new_routes, bool save)
        for (RouteList::iterator x = new_routes.begin(); x != new_routes.end(); ++x) {
 
                boost::weak_ptr<Route> wpr (*x);
+               boost::shared_ptr<Route> r (*x);
 
-               (*x)->listen_changed.connect (sigc::bind (mem_fun (*this, &Session::route_listen_changed), wpr));
-               (*x)->solo_changed.connect (sigc::bind (mem_fun (*this, &Session::route_solo_changed), wpr));
-               (*x)->mute_changed.connect (mem_fun (*this, &Session::route_mute_changed));
-               (*x)->output()->changed.connect (mem_fun (*this, &Session::set_worst_io_latencies_x));
-               (*x)->processors_changed.connect (mem_fun (*this, &Session::route_processors_changed));
-               (*x)->route_group_changed.connect (hide (mem_fun (*this, &Session::route_group_changed)));
+               r->listen_changed.connect_same_thread (*this, boost::bind (&Session::route_listen_changed, this, _1, wpr));
+               r->solo_changed.connect_same_thread (*this, boost::bind (&Session::route_solo_changed, this, _1, wpr));
+               r->mute_changed.connect_same_thread (*this, boost::bind (&Session::route_mute_changed, this, _1));
+               r->output()->changed.connect_same_thread (*this, boost::bind (&Session::set_worst_io_latencies_x, this, _1, _2));
+               r->processors_changed.connect_same_thread (*this, boost::bind (&Session::route_processors_changed, this, _1));
+               r->route_group_changed.connect_same_thread (*this, boost::bind (&Session::route_group_changed, this));
 
-               if ((*x)->is_master()) {
-                       _master_out = (*x);
+               if (r->is_master()) {
+                       _master_out = r;
                }
 
-               if ((*x)->is_control()) {
-                       _control_out = (*x);
+               if (r->is_monitor()) {
+                       _monitor_out = r;
                }
        }
 
-       if (_control_out && IO::connecting_legal) {
+       if (_monitor_out && IO::connecting_legal) {
 
                for (RouteList::iterator x = new_routes.begin(); x != new_routes.end(); ++x) {
-                       if ((*x)->is_control() || (*x)->is_master()) {
-                               continue;
-                       }
-                       (*x)->listen_via (_control_out,
-                                         (Config->get_listen_position() == AfterFaderListen ? PostFader : PreFader),
-                                         false, false);
+                       if ((*x)->is_monitor()) {
+                                /* relax */
+                        } else if ((*x)->is_master()) {
+                                /* relax */
+                       } else {
+                                (*x)->listen_via (_monitor_out,
+                                                  (Config->get_listen_position() == AfterFaderListen ? PostFader : PreFader),
+                                                  false, false);
+                        }
                }
 
                resort_routes ();
@@ -2207,6 +1973,7 @@ Session::add_routes (RouteList& new_routes, bool save)
        }
 
        RouteAdded (new_routes); /* EMIT SIGNAL */
+       Route::RemoteControlIDChange (); /* EMIT SIGNAL */
 }
 
 void
@@ -2280,7 +2047,7 @@ Session::globally_add_internal_sends (boost::shared_ptr<Route> dest, Placement p
 void
 Session::add_internal_sends (boost::shared_ptr<Route> dest, Placement p, boost::shared_ptr<RouteList> senders)
 {
-       if (dest->is_control() || dest->is_master()) {
+       if (dest->is_monitor() || dest->is_master()) {
                return;
        }
 
@@ -2290,7 +2057,7 @@ Session::add_internal_sends (boost::shared_ptr<Route> dest, Placement p, boost::
 
        for (RouteList::iterator i = senders->begin(); i != senders->end(); ++i) {
 
-               if ((*i)->is_control() || (*i)->is_master() || (*i) == dest) {
+               if ((*i)->is_monitor() || (*i)->is_master() || (*i) == dest) {
                        continue;
                }
 
@@ -2315,14 +2082,11 @@ Session::add_diskstream (boost::shared_ptr<Diskstream> dstream)
                /* writer goes out of scope, copies ds back to main */
        }
 
-       dstream->PlaylistChanged.connect (sigc::bind (mem_fun (*this, &Session::diskstream_playlist_changed), boost::weak_ptr<Diskstream> (dstream)));
+       dstream->PlaylistChanged.connect_same_thread (*this, boost::bind (&Session::diskstream_playlist_changed, this, boost::weak_ptr<Diskstream> (dstream)));
        /* this will connect to future changes, and check the current length */
        diskstream_playlist_changed (boost::weak_ptr<Diskstream> (dstream));
 
-       dstream->RecordEnableChanged.connect (mem_fun (*this, &Session::update_have_rec_enabled_diskstream));
-
-       dstream->prepare ();
-
+       dstream->RecordEnableChanged.connect_same_thread (*this, boost::bind (&Session::update_have_rec_enabled_diskstream, this));
 }
 
 void
@@ -2343,15 +2107,15 @@ Session::remove_route (shared_ptr<Route> route)
                        _master_out = shared_ptr<Route> ();
                }
 
-               if (route == _control_out) {
+               if (route == _monitor_out) {
 
                        /* cancel control outs for all routes */
 
                        for (RouteList::iterator r = rs->begin(); r != rs->end(); ++r) {
-                               (*r)->drop_listen (_control_out);
+                               (*r)->drop_listen (_monitor_out);
                        }
 
-                       _control_out.reset ();
+                       _monitor_out.reset ();
                }
 
                update_route_solo_state ();
@@ -2382,6 +2146,18 @@ Session::remove_route (shared_ptr<Route> route)
        route->input()->disconnect (0);
        route->output()->disconnect (0);
 
+       /* if the route had internal sends sending to it, remove them */
+       if (route->internal_return()) {
+
+               boost::shared_ptr<RouteList> r = routes.reader ();
+               for (RouteList::iterator i = r->begin(); i != r->end(); ++i) {
+                       boost::shared_ptr<Send> s = (*i)->internal_send_for (route);
+                       if (s) {
+                               (*i)->remove_processor (s);
+                       }
+               }
+       }       
+
        update_latency_compensation (false, false);
        set_dirty();
 
@@ -2397,6 +2173,8 @@ Session::remove_route (shared_ptr<Route> route)
 
        sync_order_keys (N_("session"));
 
+       Route::RemoteControlIDChange(); /* EMIT SIGNAL */
+
        /* save the new state of the world */
 
        if (save_state (_current_snapshot_name)) {
@@ -2451,7 +2229,7 @@ Session::route_solo_changed (void* /*src*/, boost::weak_ptr<Route> wpr)
                delta = -1;
        }
 
-       /* now mod the solo level of all other routes except master & control outs
+       /* now mod the solo level of all other routes except master/control outs/auditioner
           so that they will be silent if appropriate.
        */
 
@@ -2460,8 +2238,7 @@ Session::route_solo_changed (void* /*src*/, boost::weak_ptr<Route> wpr)
        for (RouteList::iterator i = r->begin(); i != r->end(); ++i) {
                bool via_sends_only;
 
-
-               if ((*i) == route || !(*i)->solo_isolated() || !(*i)->is_master() || !(*i)->is_control() || (*i)->is_hidden()) {
+               if ((*i) == route || (*i)->solo_isolated() || (*i)->is_master() || (*i)->is_monitor() || (*i)->is_hidden()) {
                        continue;
                } else if ((*i)->feeds (route, &via_sends_only)) {
                        if (!via_sends_only) {
@@ -2470,18 +2247,6 @@ Session::route_solo_changed (void* /*src*/, boost::weak_ptr<Route> wpr)
                } 
        }
 
-       /* make sure master is never muted by solo */
-
-       if (_master_out && route != _master_out && _master_out->soloed_by_others() == 0 && !_master_out->soloed()) {
-               _master_out->mod_solo_by_others (1);
-       }
-       /* ditto for control outs make sure master is never muted by solo */
-
-       if (_control_out && route != _control_out && _control_out && _control_out->soloed_by_others() == 0) {
-               _control_out->mod_solo_by_others (1);
-       }
-
        solo_update_disabled = false;
        update_route_solo_state (r);
        SoloChanged (); /* EMIT SIGNAL */
@@ -2491,25 +2256,38 @@ Session::route_solo_changed (void* /*src*/, boost::weak_ptr<Route> wpr)
 void
 Session::update_route_solo_state (boost::shared_ptr<RouteList> r)
 {
-       /* now figure out if anything that matters is soloed */
+       /* now figure out if anything that matters is soloed (or is "listening")*/
 
        bool something_soloed = false;
+        uint32_t listeners = 0;
 
        if (!r) {
                r = routes.reader();
        }
 
        for (RouteList::iterator i = r->begin(); i != r->end(); ++i) {
-               if (!(*i)->is_master() && !(*i)->is_control() && !(*i)->is_hidden() && (*i)->self_soloed()) {
+               if (!(*i)->is_master() && !(*i)->is_monitor() && !(*i)->is_hidden() && (*i)->self_soloed()) {
                        something_soloed = true;
                        break;
                }
-       }
 
-       if (something_soloed != _non_soloed_outs_muted) {
-               _non_soloed_outs_muted = something_soloed;
-               SoloActive (_non_soloed_outs_muted); /* EMIT SIGNAL */
+                if (!(*i)->is_hidden() && (*i)->listening()) {
+                        if (Config->get_solo_control_is_listen_control()) {
+                                listeners++;
+                        } else {
+                                (*i)->set_listen (false, this);
+                        }
+                }
        }
+
+        if (something_soloed != _non_soloed_outs_muted) {
+                _non_soloed_outs_muted = something_soloed;
+                SoloActive (_non_soloed_outs_muted); /* EMIT SIGNAL */
+        }
+
+        if (listeners) {
+                 _listen_cnt = listeners;
+        }
 }
 
 boost::shared_ptr<RouteList> 
@@ -2577,8 +2355,8 @@ Session::find_current_end ()
 
        nframes_t max = get_maximum_extent ();
 
-       if (max > end_location->end()) {
-               end_location->set_end (max);
+       if (max > _session_range_location->end()) {
+               _session_range_location->set_end (max);
                set_dirty();
                DurationChanged(); /* EMIT SIGNAL */
        }
@@ -2601,312 +2379,44 @@ Session::get_maximum_extent () const
                }
        }
 
-       return max;
-}
-
-boost::shared_ptr<Diskstream>
-Session::diskstream_by_name (string name)
-{
-       boost::shared_ptr<DiskstreamList> dsl = diskstreams.reader();
-
-       for (DiskstreamList::iterator i = dsl->begin(); i != dsl->end(); ++i) {
-               if ((*i)->name() == name) {
-                       return *i;
-               }
-       }
-
-       return boost::shared_ptr<Diskstream>((Diskstream*) 0);
-}
-
-boost::shared_ptr<Diskstream>
-Session::diskstream_by_id (const PBD::ID& id)
-{
-       boost::shared_ptr<DiskstreamList> dsl = diskstreams.reader();
-
-       for (DiskstreamList::iterator i = dsl->begin(); i != dsl->end(); ++i) {
-               if ((*i)->id() == id) {
-                       return *i;
-               }
-       }
-
-       return boost::shared_ptr<Diskstream>((Diskstream*) 0);
-}
-
-/* Region management */
-
-string
-Session::new_region_name (string old)
-{
-       string::size_type last_period;
-       uint32_t number;
-       string::size_type len = old.length() + 64;
-       char buf[len];
-
-       if ((last_period = old.find_last_of ('.')) == string::npos) {
-
-               /* no period present - add one explicitly */
-
-               old += '.';
-               last_period = old.length() - 1;
-               number = 0;
-
-       } else {
-
-               number = atoi (old.substr (last_period+1).c_str());
-
-       }
-
-       while (number < (UINT_MAX-1)) {
-
-               RegionList::const_iterator i;
-               string sbuf;
-
-               number++;
-
-               snprintf (buf, len, "%s%" PRIu32, old.substr (0, last_period + 1).c_str(), number);
-               sbuf = buf;
-
-               for (i = regions.begin(); i != regions.end(); ++i) {
-                       if (i->second->name() == sbuf) {
-                               break;
-                       }
-               }
-
-               if (i == regions.end()) {
-                       break;
-               }
-       }
-
-       if (number != (UINT_MAX-1)) {
-               return buf;
-       }
-
-       error << string_compose (_("cannot create new name for region \"%1\""), old) << endmsg;
-       return old;
-}
-
-int
-Session::region_name (string& result, string base, bool newlevel)
-{
-       char buf[16];
-       string subbase;
-
-       if (base.find("/") != string::npos) {
-               base = base.substr(base.find_last_of("/") + 1);
-       }
-
-       if (base == "") {
-
-               Glib::Mutex::Lock lm (region_lock);
-
-               snprintf (buf, sizeof (buf), "%d", (int)regions.size() + 1);
-               result = "region.";
-               result += buf;
-
-       } else {
-
-               if (newlevel) {
-                       subbase = base;
-               } else {
-                       string::size_type pos;
-
-                       pos = base.find_last_of ('.');
-
-                       /* pos may be npos, but then we just use entire base */
-
-                       subbase = base.substr (0, pos);
-
-               }
-
-               {
-                       Glib::Mutex::Lock lm (region_lock);
-
-                       map<string,uint32_t>::iterator x;
-
-                       result = subbase;
-
-                       if ((x = region_name_map.find (subbase)) == region_name_map.end()) {
-                               result += ".1";
-                               region_name_map[subbase] = 1;
-                       } else {
-                               x->second++;
-                               snprintf (buf, sizeof (buf), ".%d", x->second);
-
-                               result += buf;
-                       }
-               }
-       }
-
-       return 0;
-}
-
-void
-Session::add_region (boost::shared_ptr<Region> region)
-{
-       vector<boost::shared_ptr<Region> > v;
-       v.push_back (region);
-       add_regions (v);
-}
-
-void
-Session::add_regions (vector<boost::shared_ptr<Region> >& new_regions)
-{
-       bool added = false;
-
-       {
-               Glib::Mutex::Lock lm (region_lock);
-
-               for (vector<boost::shared_ptr<Region> >::iterator ii = new_regions.begin(); ii != new_regions.end(); ++ii) {
-
-                       boost::shared_ptr<Region> region = *ii;
-
-                       if (region == 0) {
-
-                               error << _("Session::add_region() ignored a null region. Warning: you might have lost a region.") << endmsg;
-
-                       } else {
-
-                               RegionList::iterator x;
-
-                               for (x = regions.begin(); x != regions.end(); ++x) {
-
-                                       if (region->region_list_equivalent (x->second)) {
-                                               break;
-                                       }
-                               }
-
-                               if (x == regions.end()) {
-
-                                       pair<RegionList::key_type,RegionList::mapped_type> entry;
-
-                                       entry.first = region->id();
-                                       entry.second = region;
-
-                                       pair<RegionList::iterator,bool> x = regions.insert (entry);
-
-                                       if (!x.second) {
-                                               return;
-                                       }
-
-                                       added = true;
-                               }
-                       }
-               }
-       }
-
-       /* mark dirty because something has changed even if we didn't
-          add the region to the region list.
-       */
-
-       set_dirty ();
-
-       if (added) {
-
-               vector<boost::weak_ptr<Region> > v;
-               boost::shared_ptr<Region> first_r;
-
-               for (vector<boost::shared_ptr<Region> >::iterator ii = new_regions.begin(); ii != new_regions.end(); ++ii) {
-
-                       boost::shared_ptr<Region> region = *ii;
-
-                       if (region == 0) {
-
-                               error << _("Session::add_region() ignored a null region. Warning: you might have lost a region.") << endmsg;
-
-                       } else {
-                               v.push_back (region);
-
-                               if (!first_r) {
-                                       first_r = region;
-                               }
-                       }
-
-                       region->StateChanged.connect (sigc::bind (mem_fun (*this, &Session::region_changed), boost::weak_ptr<Region>(region)));
-                       region->GoingAway.connect (sigc::bind (mem_fun (*this, &Session::remove_region), boost::weak_ptr<Region>(region)));
-
-                       update_region_name_map (region);
-               }
-
-               if (!v.empty()) {
-                       RegionsAdded (v); /* EMIT SIGNAL */
-               }
-       }
-}
-
-void
-Session::update_region_name_map (boost::shared_ptr<Region> region)
-{
-       string::size_type last_period = region->name().find_last_of ('.');
-
-       if (last_period != string::npos && last_period < region->name().length() - 1) {
-
-               string base = region->name().substr (0, last_period);
-               string number = region->name().substr (last_period+1);
-               map<string,uint32_t>::iterator x;
-
-               /* note that if there is no number, we get zero from atoi,
-                  which is just fine
-               */
-
-               region_name_map[base] = atoi (number);
-       }
-}
-
-void
-Session::region_changed (Change what_changed, boost::weak_ptr<Region> weak_region)
-{
-       boost::shared_ptr<Region> region (weak_region.lock ());
-
-       if (!region) {
-               return;
-       }
-
-       if (what_changed & Region::HiddenChanged) {
-               /* relay hidden changes */
-               RegionHiddenChange (region);
-       }
-
-       if (what_changed & NameChanged) {
-               update_region_name_map (region);
-       }
-}
-
-void
-Session::remove_region (boost::weak_ptr<Region> weak_region)
-{
-       RegionList::iterator i;
-       boost::shared_ptr<Region> region (weak_region.lock ());
-
-       if (!region) {
-               return;
-       }
-
-       bool removed = false;
+       return max;
+}
 
-       {
-               Glib::Mutex::Lock lm (region_lock);
+boost::shared_ptr<Diskstream>
+Session::diskstream_by_name (string name)
+{
+       boost::shared_ptr<DiskstreamList> dsl = diskstreams.reader();
 
-               if ((i = regions.find (region->id())) != regions.end()) {
-                       regions.erase (i);
-                       removed = true;
+       for (DiskstreamList::iterator i = dsl->begin(); i != dsl->end(); ++i) {
+               if ((*i)->name() == name) {
+                       return *i;
                }
        }
 
-       /* mark dirty because something has changed even if we didn't
-          remove the region from the region list.
-       */
+       return boost::shared_ptr<Diskstream>((Diskstream*) 0);
+}
 
-       set_dirty();
+boost::shared_ptr<Diskstream>
+Session::diskstream_by_id (const PBD::ID& id)
+{
+       boost::shared_ptr<DiskstreamList> dsl = diskstreams.reader();
 
-       if (removed) {
-                RegionRemoved(region); /* EMIT SIGNAL */
+       for (DiskstreamList::iterator i = dsl->begin(); i != dsl->end(); ++i) {
+               if ((*i)->id() == id) {
+                       return *i;
+               }
        }
+
+       return boost::shared_ptr<Diskstream>((Diskstream*) 0);
 }
 
+/* Region management */
+
 boost::shared_ptr<Region>
-Session::find_whole_file_parent (boost::shared_ptr<Region const> child)
+Session::find_whole_file_parent (boost::shared_ptr<Region const> child) const
 {
-       RegionList::iterator i;
+        const RegionFactory::RegionMap& regions (RegionFactory::regions());
+       RegionFactory::RegionMap::const_iterator i;
        boost::shared_ptr<Region> region;
 
        Glib::Mutex::Lock lm (region_lock);
@@ -2926,13 +2436,6 @@ Session::find_whole_file_parent (boost::shared_ptr<Region const> child)
        return boost::shared_ptr<Region> ();
 }
 
-void
-Session::find_equivalent_playlist_regions (boost::shared_ptr<Region> region, vector<boost::shared_ptr<Region> >& result)
-{
-       for (PlaylistList::iterator i = playlists.begin(); i != playlists.end(); ++i)
-               (*i)->get_region_list_equivalent_regions (region, result);
-}
-
 int
 Session::destroy_region (boost::shared_ptr<Region> region)
 {
@@ -2952,10 +2455,10 @@ Session::destroy_region (boost::shared_ptr<Region> region)
 
        for (vector<boost::shared_ptr<Source> >::iterator i = srcs.begin(); i != srcs.end(); ++i) {
 
-                       (*i)->mark_for_remove ();
-                       (*i)->drop_references ();
-
-                       cerr << "source was not used by any playlist\n";
+                (*i)->mark_for_remove ();
+                (*i)->drop_references ();
+                
+                cerr << "source was not used by any playlist\n";
        }
 
        return 0;
@@ -2993,13 +2496,6 @@ Session::remove_last_capture ()
        return 0;
 }
 
-int
-Session::remove_region_from_region_list (boost::shared_ptr<Region> r)
-{
-       remove_region (r);
-       return 0;
-}
-
 /* Source Management */
 
 void
@@ -3017,7 +2513,6 @@ Session::add_source (boost::shared_ptr<Source> source)
        }
 
        if (result.second) {
-               source->GoingAway.connect (sigc::bind (mem_fun (this, &Session::remove_source), boost::weak_ptr<Source> (source)));
                set_dirty();
        }
 
@@ -3058,23 +2553,6 @@ Session::remove_source (boost::weak_ptr<Source> src)
        }
 }
 
-/** Return the number of playlists (not regions) that contain @a src */
-uint32_t
-Session::source_use_count (boost::shared_ptr<const Source> src) const
-{
-       uint32_t count = 0;
-       for (PlaylistList::const_iterator p = playlists.begin(); p != playlists.end(); ++p) {
-               for (Playlist::RegionList::const_iterator r = (*p)->region_list().begin();
-                               r != (*p)->region_list().end(); ++r) {
-                       if ((*r)->uses_source(src)) {
-                               ++count;
-                               break;
-                       }
-               }
-       }
-       return count;
-}
-
 boost::shared_ptr<Source>
 Session::source_by_id (const PBD::ID& id)
 {
@@ -3416,42 +2894,6 @@ Session::create_midi_source_for_session (MidiDiskstream& ds)
 }
 
 
-/* Playlist management */
-
-boost::shared_ptr<Playlist>
-Session::playlist_by_name (string name)
-{
-       Glib::Mutex::Lock lm (playlist_lock);
-       for (PlaylistList::iterator i = playlists.begin(); i != playlists.end(); ++i) {
-               if ((*i)->name() == name) {
-                       return* i;
-               }
-       }
-       for (PlaylistList::iterator i = unused_playlists.begin(); i != unused_playlists.end(); ++i) {
-               if ((*i)->name() == name) {
-                       return* i;
-               }
-       }
-
-       return boost::shared_ptr<Playlist>();
-}
-
-void
-Session::unassigned_playlists (std::list<boost::shared_ptr<Playlist> > & list)
-{
-       Glib::Mutex::Lock lm (playlist_lock);
-       for (PlaylistList::iterator i = playlists.begin(); i != playlists.end(); ++i) {
-               if (!(*i)->get_orig_diskstream_id().to_s().compare ("0")) {
-                       list.push_back (*i);
-               }
-       }
-       for (PlaylistList::iterator i = unused_playlists.begin(); i != unused_playlists.end(); ++i) {
-               if (!(*i)->get_orig_diskstream_id().to_s().compare ("0")) {
-                       list.push_back (*i);
-               }
-       }
-}
-
 void
 Session::add_playlist (boost::shared_ptr<Playlist> playlist, bool unused)
 {
@@ -3459,75 +2901,13 @@ Session::add_playlist (boost::shared_ptr<Playlist> playlist, bool unused)
                return;
        }
 
-       {
-               Glib::Mutex::Lock lm (playlist_lock);
-               if (find (playlists.begin(), playlists.end(), playlist) == playlists.end()) {
-                       playlists.insert (playlists.begin(), playlist);
-                       playlist->InUse.connect (sigc::bind (mem_fun (*this, &Session::track_playlist), boost::weak_ptr<Playlist>(playlist)));
-                       playlist->GoingAway.connect (sigc::bind (mem_fun (*this, &Session::remove_playlist), boost::weak_ptr<Playlist>(playlist)));
-               }
-       }
+       playlists->add (playlist);
 
        if (unused) {
                playlist->release();
        }
 
        set_dirty();
-
-       PlaylistAdded (playlist); /* EMIT SIGNAL */
-}
-
-void
-Session::get_playlists (vector<boost::shared_ptr<Playlist> >& s)
-{
-       {
-               Glib::Mutex::Lock lm (playlist_lock);
-               for (PlaylistList::iterator i = playlists.begin(); i != playlists.end(); ++i) {
-                       s.push_back (*i);
-               }
-               for (PlaylistList::iterator i = unused_playlists.begin(); i != unused_playlists.end(); ++i) {
-                       s.push_back (*i);
-               }
-       }
-}
-
-void
-Session::track_playlist (bool inuse, boost::weak_ptr<Playlist> wpl)
-{
-       boost::shared_ptr<Playlist> pl(wpl.lock());
-
-       if (!pl) {
-               return;
-       }
-
-       PlaylistList::iterator x;
-
-       if (pl->hidden()) {
-               /* its not supposed to be visible */
-               return;
-       }
-
-       {
-               Glib::Mutex::Lock lm (playlist_lock);
-
-               if (!inuse) {
-
-                       unused_playlists.insert (pl);
-
-                       if ((x = playlists.find (pl)) != playlists.end()) {
-                               playlists.erase (x);
-                       }
-
-
-               } else {
-
-                       playlists.insert (pl);
-
-                       if ((x = unused_playlists.find (pl)) != unused_playlists.end()) {
-                               unused_playlists.erase (x);
-                       }
-               }
-       }
 }
 
 void
@@ -3543,26 +2923,9 @@ Session::remove_playlist (boost::weak_ptr<Playlist> weak_playlist)
                return;
        }
 
-       {
-               Glib::Mutex::Lock lm (playlist_lock);
-
-               PlaylistList::iterator i;
-
-               i = find (playlists.begin(), playlists.end(), playlist);
-               if (i != playlists.end()) {
-                       playlists.erase (i);
-               }
-
-               i = find (unused_playlists.begin(), unused_playlists.end(), playlist);
-               if (i != unused_playlists.end()) {
-                       unused_playlists.erase (i);
-               }
-
-       }
+       playlists->remove (playlist);
 
        set_dirty();
-
-       PlaylistRemoved (playlist); /* EMIT SIGNAL */
 }
 
 void
@@ -3576,7 +2939,7 @@ Session::set_audition (boost::shared_ptr<Region> r)
 void
 Session::audition_playlist ()
 {
-       Event* ev = new Event (Event::Audition, Event::Add, Event::Immediate, 0, 0.0);
+       SessionEvent* ev = new SessionEvent (SessionEvent::Audition, SessionEvent::Add, SessionEvent::Immediate, 0, 0.0);
        ev->region.reset ();
        queue_event (ev);
 }
@@ -3596,7 +2959,7 @@ Session::non_realtime_set_audition ()
 void
 Session::audition_region (boost::shared_ptr<Region> r)
 {
-       Event* ev = new Event (Event::Audition, Event::Add, Event::Immediate, 0, 0.0);
+       SessionEvent* ev = new SessionEvent (SessionEvent::Audition, SessionEvent::Add, SessionEvent::Immediate, 0, 0.0);
        ev->region = r;
        queue_event (ev);
 }
@@ -3604,7 +2967,7 @@ Session::audition_region (boost::shared_ptr<Region> r)
 void
 Session::cancel_audition ()
 {
-       if (auditioner->active()) {
+       if (auditioner->auditioning()) {
                auditioner->cancel_audition ();
                AuditionActive (false); /* EMIT SIGNAL */
        }
@@ -3613,6 +2976,12 @@ Session::cancel_audition ()
 bool
 Session::RoutePublicOrderSorter::operator() (boost::shared_ptr<Route> a, boost::shared_ptr<Route> b)
 {
+        if (a->is_monitor()) { 
+                return true;
+        }
+        if (b->is_monitor()) {
+                return false;
+        }
        return a->order_key(N_("signal")) < b->order_key(N_("signal"));
 }
 
@@ -3628,8 +2997,8 @@ Session::remove_empty_sounds ()
        TapeFileMatcher tape_file_matcher;
 
        remove_if (audio_filenames.begin(), audio_filenames.end(),
-                       sigc::mem_fun (tape_file_matcher, &TapeFileMatcher::matches));
-
+                  boost::bind (&TapeFileMatcher::matches, &tape_file_matcher, _1));
+       
        for (vector<string>::iterator i = audio_filenames.begin(); i != audio_filenames.end(); ++i) {
 
                sys::path audio_file_path (_session_dir->sound_path());
@@ -3657,54 +3026,12 @@ Session::is_auditioning () const
 {
        /* can be called before we have an auditioner object */
        if (auditioner) {
-               return auditioner->active();
+               return auditioner->auditioning();
        } else {
                return false;
        }
 }
 
-void
-Session::set_all_solo (bool yn)
-{
-       shared_ptr<RouteList> r = routes.reader ();
-
-       for (RouteList::iterator i = r->begin(); i != r->end(); ++i) {
-               if (!(*i)->is_hidden()) {
-                       (*i)->set_solo (yn, this);
-               }
-       }
-
-       set_dirty();
-}
-
-void
-Session::set_all_listen (bool yn)
-{
-       shared_ptr<RouteList> r = routes.reader ();
-
-       for (RouteList::iterator i = r->begin(); i != r->end(); ++i) {
-               if (!(*i)->is_hidden()) {
-                       (*i)->set_listen (yn, this);
-               }
-       }
-
-       set_dirty();
-}
-
-void
-Session::set_all_mute (bool yn)
-{
-       shared_ptr<RouteList> r = routes.reader ();
-
-       for (RouteList::iterator i = r->begin(); i != r->end(); ++i) {
-               if (!(*i)->is_hidden()) {
-                       (*i)->set_mute (yn, this);
-               }
-       }
-
-       set_dirty();
-}
-
 uint32_t
 Session::n_diskstreams () const
 {
@@ -3750,59 +3077,6 @@ Session::graph_reordered ()
        }
 }
 
-void
-Session::record_disenable_all ()
-{
-       record_enable_change_all (false);
-}
-
-void
-Session::record_enable_all ()
-{
-       record_enable_change_all (true);
-}
-
-void
-Session::record_enable_change_all (bool yn)
-{
-       shared_ptr<RouteList> r = routes.reader ();
-
-       for (RouteList::iterator i = r->begin(); i != r->end(); ++i) {
-               boost::shared_ptr<Track> t;
-
-               if ((t = boost::dynamic_pointer_cast<Track>(*i)) != 0) {
-                       t->set_record_enable (yn, this);
-               }
-       }
-
-       /* since we don't keep rec-enable state, don't mark session dirty */
-}
-
-void
-Session::add_processor (Processor* processor)
-{
-       processor->GoingAway.connect (sigc::bind (mem_fun (*this, &Session::remove_processor), processor));
-       set_dirty();
-}
-
-void
-Session::remove_processor (Processor* processor)
-{
-       Send* send;
-       Return* retrn;
-       PortInsert* port_insert;
-
-       if ((port_insert = dynamic_cast<PortInsert *> (processor)) != 0) {
-               insert_bitset[port_insert->bit_slot()] = false;
-       } else if ((send = dynamic_cast<Send *> (processor)) != 0) {
-               send_bitset[send->bit_slot()] = false;
-       } else if ((retrn = dynamic_cast<Return *> (processor)) != 0) {
-               return_bitset[retrn->bit_slot()] = false;
-       }
-
-       set_dirty();
-}
-
 nframes_t
 Session::available_capture_duration ()
 {
@@ -3890,17 +3164,11 @@ Session::bundle_by_name (string name) const
 }
 
 void
-Session::tempo_map_changed (Change)
+Session::tempo_map_changed (const PropertyChange&)
 {
        clear_clicks ();
 
-       for (PlaylistList::iterator i = playlists.begin(); i != playlists.end(); ++i) {
-               (*i)->update_after_tempo_map_change ();
-       }
-
-       for (PlaylistList::iterator i = unused_playlists.begin(); i != unused_playlists.end(); ++i) {
-               (*i)->update_after_tempo_map_change ();
-       }
+       playlists->update_after_tempo_map_change ();
 
        set_dirty ();
 }
@@ -3911,18 +3179,7 @@ Session::tempo_map_changed (Change)
 void
 Session::ensure_buffers (ChanCount howmany)
 {
-       if (current_block_size == 0) {
-               return; // too early? (is this ok?)
-       }
-
-       for (DataType::iterator t = DataType::begin(); t != DataType::end(); ++t) {
-               size_t count = std::max(_scratch_buffers->available().get(*t), howmany.get(*t));
-               _scratch_buffers->ensure_buffers (*t, count, _engine.raw_buffer_size(*t));
-               _mix_buffers->ensure_buffers (*t, count, _engine.raw_buffer_size(*t));
-               _silent_buffers->ensure_buffers (*t, count, _engine.raw_buffer_size(*t));
-       }
-
-       allocate_pan_automation_buffers (current_block_size, howmany.n_audio(), false);
+        BufferManager::ensure_buffers (howmany);
 }
 
 void
@@ -4029,39 +3286,60 @@ Session::mark_insert_id (uint32_t id)
        insert_bitset[id] = true;
 }
 
+void
+Session::unmark_send_id (uint32_t id)
+{
+       if (id < send_bitset.size()) {
+                send_bitset[id] = false;
+        }
+}
+
+void
+Session::unmark_return_id (uint32_t id)
+{
+       if (id < return_bitset.size()) {
+                return_bitset[id] = false;
+        }
+}
+
+void
+Session::unmark_insert_id (uint32_t id)
+{
+       if (id < insert_bitset.size()) {
+                insert_bitset[id] = false;
+        }
+}
+
+
 /* Named Selection management */
 
-NamedSelection *
+boost::shared_ptr<NamedSelection>
 Session::named_selection_by_name (string name)
 {
        Glib::Mutex::Lock lm (named_selection_lock);
        for (NamedSelectionList::iterator i = named_selections.begin(); i != named_selections.end(); ++i) {
                if ((*i)->name == name) {
-                       returni;
+                       return *i;
                }
        }
-       return 0;
+       return boost::shared_ptr<NamedSelection>();
 }
 
 void
-Session::add_named_selection (NamedSelection* named_selection)
+Session::add_named_selection (boost::shared_ptr<NamedSelection> named_selection)
 {
        {
                Glib::Mutex::Lock lm (named_selection_lock);
                named_selections.insert (named_selections.begin(), named_selection);
        }
 
-       for (list<boost::shared_ptr<Playlist> >::iterator i = named_selection->playlists.begin(); i != named_selection->playlists.end(); ++i) {
-               add_playlist (*i);
-       }
-
        set_dirty();
 
        NamedSelectionAdded (); /* EMIT SIGNAL */
 }
 
 void
-Session::remove_named_selection (NamedSelection* named_selection)
+Session::remove_named_selection (boost::shared_ptr<NamedSelection> named_selection)
 {
        bool removed = false;
 
@@ -4071,7 +3349,6 @@ Session::remove_named_selection (NamedSelection* named_selection)
                NamedSelectionList::iterator i = find (named_selections.begin(), named_selections.end(), named_selection);
 
                if (i != named_selections.end()) {
-                       delete (*i);
                        named_selections.erase (i);
                        set_dirty();
                        removed = true;
@@ -4121,40 +3398,8 @@ Session::route_name_internal (string n) const
        return false;
 }
 
-uint32_t
-Session::n_playlists () const
-{
-       Glib::Mutex::Lock lm (playlist_lock);
-       return playlists.size();
-}
-
-void
-Session::allocate_pan_automation_buffers (nframes_t nframes, uint32_t howmany, bool force)
-{
-       if (!force && howmany <= _npan_buffers) {
-               return;
-       }
-
-       if (_pan_automation_buffer) {
-
-               for (uint32_t i = 0; i < _npan_buffers; ++i) {
-                       delete [] _pan_automation_buffer[i];
-               }
-
-               delete [] _pan_automation_buffer;
-       }
-
-       _pan_automation_buffer = new pan_t*[howmany];
-
-       for (uint32_t i = 0; i < howmany; ++i) {
-               _pan_automation_buffer[i] = new pan_t[nframes];
-       }
-
-       _npan_buffers = howmany;
-}
-
 int
-Session::freeze (InterThreadInfo& itt)
+Session::freeze_all (InterThreadInfo& itt)
 {
        shared_ptr<RouteList> r = routes.reader ();
 
@@ -4166,7 +3411,7 @@ Session::freeze (InterThreadInfo& itt)
                        /* XXX this is wrong because itt.progress will keep returning to zero at the start
                           of every track.
                        */
-                       t->freeze (itt);
+                       t->freeze_me (itt);
                }
        }
 
@@ -4198,8 +3443,7 @@ Session::write_one_track (AudioTrack& track, nframes_t start, nframes_t end,
                return result;
        }
 
-       // any bigger than this seems to cause stack overflows in called functions
-       const nframes_t chunk_size = (128 * 1024)/4;
+       const nframes_t chunk_size = (256 * 1024)/4;
 
        // block all process callback handling
 
@@ -4303,9 +3547,14 @@ Session::write_one_track (AudioTrack& track, nframes_t start, nframes_t end,
 
                /* construct a region to represent the bounced material */
 
-               result = RegionFactory::create (srcs, 0,
-                               srcs.front()->length(srcs.front()->timeline_position()),
-                               region_name_from_path (srcs.front()->name(), true));
+               PropertyList plist;
+               
+               plist.add (Properties::start, 0);
+               plist.add (Properties::length, srcs.front()->length(srcs.front()->timeline_position()));
+               plist.add (Properties::name, region_name_from_path (srcs.front()->name(), true));
+               
+               result = RegionFactory::create (srcs, plist);
+                          
        }
 
   out:
@@ -4334,9 +3583,23 @@ Session::write_one_track (AudioTrack& track, nframes_t start, nframes_t end,
        return result;
 }
 
+gain_t*
+Session::gain_automation_buffer() const
+{
+        return ProcessThread::gain_automation_buffer ();
+}
+
+pan_t**
+Session::pan_automation_buffer() const
+{
+        return ProcessThread::pan_automation_buffer ();
+}
+
 BufferSet&
 Session::get_silent_buffers (ChanCount count)
 {
+        return ProcessThread::get_silent_buffers (count);
+#if 0
        assert(_silent_buffers->available() >= count);
        _silent_buffers->set_count(count);
 
@@ -4347,11 +3610,14 @@ Session::get_silent_buffers (ChanCount count)
        }
 
        return *_silent_buffers;
+#endif
 }
 
 BufferSet&
 Session::get_scratch_buffers (ChanCount count)
 {
+        return ProcessThread::get_scratch_buffers (count);
+#if 0
        if (count != ChanCount::ZERO) {
                assert(_scratch_buffers->available() >= count);
                _scratch_buffers->set_count(count);
@@ -4360,14 +3626,18 @@ Session::get_scratch_buffers (ChanCount count)
        }
 
        return *_scratch_buffers;
+#endif
 }
 
 BufferSet&
 Session::get_mix_buffers (ChanCount count)
 {
+        return ProcessThread::get_mix_buffers (count);
+#if 0
        assert(_mix_buffers->available() >= count);
        _mix_buffers->set_count(count);
        return *_mix_buffers;
+#endif
 }
 
 uint32_t
@@ -4415,6 +3685,10 @@ Session::compute_initial_length ()
 void
 Session::sync_order_keys (std::string const & base)
 {
+       if (deletion_in_progress()) {
+               return;
+       }
+
        if (!Config->get_sync_all_route_ordering()) {
                /* leave order keys as they are */
                return;
@@ -4427,8 +3701,11 @@ Session::sync_order_keys (std::string const & base)
        }
 
        Route::SyncOrderKeys (base); // EMIT SIGNAL
-}
 
+       /* this might not do anything */
+
+       set_remote_control_ids ();
+}
 
 /** @return true if there is at least one record-enabled diskstream, otherwise false */
 bool
@@ -4474,7 +3751,7 @@ Session::listen_position_changed ()
        boost::shared_ptr<RouteList> r = routes.reader ();
 
        for (RouteList::iterator i = r->begin(); i != r->end(); ++i) {
-               (*i)->put_control_outs_at (p);
+               (*i)->put_monitor_send_at (p);
        }
 }
 
@@ -4483,11 +3760,11 @@ Session::solo_control_mode_changed ()
 {
        /* cancel all solo or all listen when solo control mode changes */
 
-       if (Config->get_solo_control_is_listen_control()) {
-               set_all_solo (false);
-       } else {
-               set_all_listen (false);
-       }
+        if (soloing()) {
+                set_solo (get_routes(), false);
+        } else if (listening()) {
+                set_listen (get_routes(), false);
+        }
 }
 
 void
@@ -4543,5 +3820,3 @@ Session::get_routes_with_regions_at (nframes64_t const p) const
 
        return rl;
 }
-
-