0f5f494173
- Build synth_engine object with type, plugin_id, soundfont_bank, soundfont_program, soundfont_id - Save to targetTrack.synth_engine so schedulePianoRollMidi reads it - Pass synthEngine as 3rd arg to applyAITrackInstrument (was missing) - Remove redundant separate loadSoundFont call (applyAITrackInstrument chains to selectInstrument which already calls loadSoundFont)