Ok, Lars. I’ll send you a video capture (with audio) soon. It shows the problem the other way round where playing back the long live recorded MIDI drum track through to the end shows no problem with sync, but then if you reply the last minute of the recording, you’ll hear the sync error between the MIDI and audio track.
It also shows the problem with trying to record a drum track to someone who has recorded without using a click track…lol. 