Update solo/mute example script (use sessions' set_control(s)

diff --git a/scripts/s_track_props.lua b/scripts/s_track_props.lua
index ace268e920ccadd3924ba397cfd3323b7312813e..ad983f83647df41426cadc7b8d5c815c39d32082 100644 (file)
--- a/scripts/s_track_props.lua
+++ b/scripts/s_track_props.lua
@@ -21,12 +21,22 @@ function factory () return function ()
                        -- phase invert the 1st channel
                        t:phase_control():set_phase_invert (1, true)
 
-                       -- solo the track  -- and only the track, 
-                       -- not other tracks grouped with it.
-                       t:solo_control():set_value (1, PBD.GroupControlDisposition.NoGroup)
-
-                       -- unmute the track
-                       t:mute_control():set_value (0, PBD.GroupControlDisposition.NoGroup)
+                       -- solo the track -- and only the track, not other tracks grouped with it.
+                       --
+                       -- Note that changing solo/mute needs to propagate implicit solo/mute.
+                       -- These changes have to be done atomically, so that all
+                       -- related solo/mute change simultaneously at the same time.
+                       -- This can only be done from realtime-context, so we need to queue a session-rt
+                       -- event using the session realtime-event dispatch mechanism:
+                       Session:set_control (t:solo_control(), 1, PBD.GroupControlDisposition.NoGroup)
+
+                       -- unmute the track, this also examplifies how one could use lists to modify
+                       -- multiple controllables at the same time (they should be of the same
+                       -- paramater type - e.g. mute_control() of multiple tracks, they'll all
+                       -- change simultaneously in rt-context)
+                       local ctrls = ARDOUR.ControlListPtr ()
+                       ctrls:push_back (t:mute_control()) -- we could add more controls to change via push_back
+                       Session:set_controls (ctrls, 0, PBD.GroupControlDisposition.NoGroup)
 
                        -- add a track comment
                        t:set_comment ("This is a Drum Track", nil)