Refine 31f79489, de-duplicate AU I/O configurations

1 files changed, 10 insertions, 0 deletions

diff --git a/libs/ardour/audio_unit.cc b/libs/ardour/audio_unit.cc
index 76e456218a..867040a8d0 100644
--- a/libs/ardour/audio_unit.cc
+++ b/libs/ardour/audio_unit.cc
@@ -1278,6 +1278,11 @@ AUPlugin::can_support_io_configuration (const ChanCount& in, ChanCount& out, Cha
 				// on the 2nd bus.
 				io_configs.push_back (pair<int,int> (possible_in + bus_inputs[i], possible_out));
 			}
+			/* only add additional, optional busses to first available config.
+			 * AUPluginInfo::cached_io_configuration () already incrementally
+			 * adds busses (for instruments w/ multiple configurations)
+			 */
+			break;
 		}
 	}
 
@@ -1296,6 +1301,11 @@ AUPlugin::can_support_io_configuration (const ChanCount& in, ChanCount& out, Cha
 				}
 				io_configs.push_back (pair<int,int> (possible_in, possible_out + c));
 			}
+			/* only add additional, optional busses to first available config.
+			 * AUPluginInfo::cached_io_configuration () already incrementally
+			 * adds busses (for instruments w/ multiple configurations)
+			 */
+			break;
 		}
 	}