Did you see/try the instructions at the bottom of the link below about voices shutting down with the auto tune function
Also, there’s a firmware upgrade not too long ago if you haven’t done that yet (pick the right one for your processor part number).
Scott in Ohio
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Sent: Monday, August 24, 2015 10:23 PM
Subject: [oberheim] Re: Autotune on OBXa suddenly shutting down all voices
So I finally figured out the problem with this machine. I was on the phone with Bruce Forat about my Linn 9000 and he suggested disabling the midi kit and taking the machine back to stock. I did so an autotune works fine now.
Unfortunately my memory seems to not be working anymore on the OBXa though. I can only use manual mode. Anything I save to memory doesn't work. Even loading the presets via tape backup leaves memory not working correctly. It seems like some things change with the changing of patches i.e. Saw to Pulse etc. but the sound that comes out is just a slow attack rumble/whine of dischord.
So any ideas there And I'd REALLY love to keep this MIDI kit in. I emailed Tony at Encore MIDI but as per usual I get no response. So any ideas there are welcome too.