Improve MIDI SPP accuracy
Unfortunately the MIDI SPP is only accurate on 1/16 positions. Qtractor's position have a much higher resolution. At the moment Qtractor rounds the SPP which leads to non-synchronized positions.
Based on my experiences with jack_midi_clock I propose the same or a similar approach:
When playback starts, then send immediately
- MIDI CLOCK
- MIDI SPP of a position in the future, e.g. the next but one beats or 1/8 or 1/16 position
When this position is reached then send