- if (!vca) {
- /* unassign from all */
- _gain_control->clear_masters ();
- _solo_control->clear_masters ();
- _mute_control->clear_masters ();
- } else {
- _gain_control->remove_master (vca->gain_control());
- _solo_control->remove_master (vca->solo_control());
- _mute_control->remove_master (vca->mute_control());