Hi Christian, As per our conversation in the forum I am requesting that we be able to send an "ALL_NOTES_OFF" command via LSCP. Thank you!
This is now implemented in latest LinuxSampler CVS version. You can send arbitrary MIDI CCs via LSCP now, as described in the updated LSCP specs: http://www.linuxsampler.org/api/draft-linuxsampler- So, all notes off (on sampler channel 0) would be e.g.: SEND CHANNEL MIDI_DATA CC 0 120 0 MIDI CC 120 = all-notes-off is hard coded (src/engines/EngineBase.h, method ProcessHardcodedControllers()) for all sampler engines (that is currently gig, sfz and sf2). You can use the same procedure for all other dynamic and hard coded controllers of course.
Closing report now, since feature is implemented now.