My MOTM-650 GATE1 output is acting funny. I'm seeing a 400 usec negative pulse every 250 msec while a MIDI note on is active. The 12V output is high except for the unwanted pulse. The low end of the pulse 0V. It's making my env gen retrigger every 250 msec. I have it configured for 1/1/1/1 receiving on MIDI channels 2,3,4,5 respectively and this problem doesn't appear on GATE2, GATE3, or GATE4. All gate outputs are set for Normal (not STrig). Measurements were made with a scope.
Is there some operational mode that I'm not aware of that permits this kind of behavior?
Thanks, John