A world update pulled in 0.5.7 and I have been tracking down a strange problem. I just downgraded to 0.5.6 and the problem went away.
Note: using only MIDI, no digital audio, using external USB MIDI device, no softsynths, setup has been fairly stable for several years. the only change here was qtractor version as reported by genlop listing of emerge logs
Initial symptom was session playback metronome was inconsistent, MIDI events would slowdown after several measures, drop notes and then jump forward to catch up to metronome.
Created a new session with simple MIDI track, just single quarter notes, the symptom was playback of the single note "sounds" correct. Meaning to my ear the timing was ok. But the GUI playhead in 0.5.7 is constantly falling behind. About a half note behind after 8 measures, a whole note behind after 16. Note: Lag time is just estimated.
After downgrading, I see the following message opening every session:
07:45:16.828 The original session sample rate (48000 Hz) is not the same of the current audio engine (44100 Hz). Saving and reloading from a new session file is highly recommended.
My jackd setup is at 44100 Hz. However, I am not doing any digital audio in this current situation so am unsure this is related or not.
After downgrade all test sessions run in a constant time and playback all notes performed.
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