if any of the MIDI tracks are set to output to the "GM" bus then the peak meters on the "GM Out (MIDI)" bus should move along as same as all MIDI tracks that are merging into it during playback, no matter which plugin or instrument is inserted there or there...
otoh. i am sorry to tell that calf-fluidsynth.lv2 is not that of a so called reference standard to the multi-timbral schema i've been suggesting about... especially when you set some some instrument/bank or program at the Tracks/Properties... whatever...
as a rule of thumb, when dealing with instrument plugins, NEVER set, touch or mess with the Instrument, Bank nor Program properties of a MIDI track. Keep it all to "(No instrument)", and/or "(None)". You've been advised ;) The rather majority of LV2 instrument plugins out there have no notion of "programs" (as DSSI or VST ones do) and when they happen to support the outcasted lv2_programs extension they only happen to work when inserted on a MIDI track; while on a (multi-channel) MIDI output bus the behavior is undefined or simply wrong.
hi oscillator
if any of the MIDI tracks are set to output to the "GM" bus then the peak meters on the "GM Out (MIDI)" bus should move along as same as all MIDI tracks that are merging into it during playback, no matter which plugin or instrument is inserted there or there...
otoh. i am sorry to tell that calf-fluidsynth.lv2 is not that of a so called reference standard to the multi-timbral schema i've been suggesting about... especially when you set some some instrument/bank or program at the Tracks/Properties... whatever...
as a rule of thumb, when dealing with instrument plugins, NEVER set, touch or mess with the Instrument, Bank nor Program properties of a MIDI track. Keep it all to "(No instrument)", and/or "(None)". You've been advised ;) The rather majority of LV2 instrument plugins out there have no notion of "programs" (as DSSI or VST ones do) and when they happen to support the outcasted lv2_programs extension they only happen to work when inserted on a MIDI track; while on a (multi-channel) MIDI output bus the behavior is undefined or simply wrong.
hth.
cheers