Hi Givati - I tried what you described (with two Instrument tracks) it to see if I could duplicate the issue, but it worked fine, everything stayed in sync with the click. A couple of troubleshooting questions.. - Are you recording MIDI or audio? - Did you make any edits before you went back to fix the original track? - If either of the tracks was audio, did you change the tempo at any time? And if so, did you have Flex/Follow Tempo on or off? (Flex/Follow tempo might be a likely culprit for audio regions getting out of sync with the project tempo—the metronome).. If you try the same thing in a new GB song, can you duplicate the problem?