add group disposition argument to Route::set_gain() and use it in various UIs

Executive decisions were necessary in a couple of places about the correct group disposition
behaviour, notably faderport and OSC surfaces

1 files changed, 5 insertions, 1 deletions

diff --git a/libs/surfaces/faderport/faderport.cc b/libs/surfaces/faderport/faderport.cc
index 9481445af2..50250a5f13 100644
--- a/libs/surfaces/faderport/faderport.cc
+++ b/libs/surfaces/faderport/faderport.cc
@@ -499,7 +499,11 @@ FaderPort::fader_handler (MIDI::Parser &, MIDI::EventTwoBytes* tb)
 			if (gain) {
 				int ival = (fader_msb << 7) | fader_lsb;
 				float val = gain->interface_to_internal (ival/16384.0);
-				_current_route->set_gain (val, this);
+				/* even though the faderport only controls a
+				   single route at a time, allow the fader to
+				   modify the group, if appropriate.
+				*/
+				_current_route->set_gain (val, Controllable::UseGroup);
 			}
 		}
 	}