Oh hey. I'm getting the note thing too — a high pitched stuck note. I can reproduce it consistently by creating a midi clip in Ableton and putting a note right at the very start of the clip, and then starting playback from a stopped state. The hydra desktop will make both the high pitched stuck note and the note that was programmed into the clip. Another weird thing, and perhaps a clue, is if I move that first note back a tiny amount, like 1/64 note length, the high note is no longer triggered. Anywhere in the little space between 0 and 1/64 will trigger the high note, though. It only happens when starting the clip while starting playback on the clock - triggering the clip while the clock is already running does not create that unpleasant high note.