Had a Rev2 for a few years and (since the last BIOS upgrade ?) I started to face permanent issues.
The whole machine did sound super weird. Did a few calibrations, some succeeded, some failed.
I finally reseted global settings and that helped. But when I start initial program and pick a simple triangle, every 8 notes is beeping weirdly. Haven't yest pulled the scope to look at it but man, this machine has always been a PITA since I had it. Bad design?
Is there something to do to get it well? A battery to change that might have depleted and caused memory loss?