Many thanks for the help
I’ve come to find the problem is bigger than I realized. When I first turn on the Chroma Polaris I can play a few notes and then about 5 notes in the note gets held / stuck and the entire synth is locked up and unresponsive. It has the new membrane panels on it and had been fully restored about two years ago. But somewhere around 5 to 10 seconds after being turned on it locks up. Prior to that point all membrane buttons appear to work and the sounds are correct. I’ve tried lower function 12 to reset it but that doesn’t change anything. Is there anything I should re-seat or switch the battery out or other troubleshooting I could do. Recently this was working fantastically so this is a disappointment.