It finishes the progression before it applies the key change. I figured that sounded most natural. I might want to write that down somewhere, though.

Thank you! You are absolutely right; the start/stop is not working perfectly at the moment. ‘Stop’ ends the music after it finishes the progression, ‘start’ immediately starts a new progression without waiting for the old to actually stop. Guess it’s worth to point out that this in no way is considered a finished product :)

Hehe, the underlying chords plays a big role, yes ;)

Thanks for the tip, will check into that!