fix AU sidechain connection

diff --git a/libs/ardour/plugin_insert.cc b/libs/ardour/plugin_insert.cc
index 0aeeae88112acf317bca1f441fbeb583ad2de106..a91ca6e9c0bcedf6d93de9f011a2f5fd5c50de47 100644 (file)
--- a/libs/ardour/plugin_insert.cc
+++ b/libs/ardour/plugin_insert.cc
@@ -1435,7 +1435,7 @@ PluginInsert::configure_io (ChanCount in, ChanCount out)
                        bool const r = _plugins.front()->can_support_io_configuration (_configured_internal, dout, &useins);
                        assert (r);
                        if (useins.n_audio() == 0) {
-                               useins = in;
+                               useins = _configured_internal;
                        }
                        DEBUG_TRACE (DEBUG::ChanMapping, string_compose ("%1: Delegate configuration: %2 %3\n", name(), useins, dout));