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Prophet 600 MIDI problem - notes drone in polyphony

Prophet 600 MIDI problem - notes drone in polyphony
« on: August 13, 2018, 06:44:39 PM »
Hey all. I just posted this in Gearslutz but realized I'd probably get a more qualified response here.

I'm trying to control my Prophet 600 via MIDI controller (a Roland JV-90), and it works OK so long as I only play one note at a time. The second I try playing a chord of any kind, the notes drone indefinitely. I can interrupt the drone by tweaking any parameter, but the same issue persists as soon as I press more than one note. Any ideas?