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Prophet 6 grounding noise

Prophet 6 grounding noise
« on: March 21, 2021, 12:54:51 PM »
Hey!

I'm the proud owner of a prophet 6. I'm having a very weird "ground" type noise on the synth.

Examples:

https://youtu.be/11pnf5QReNs

https://youtu.be/JLQmxYoGtmI

I already tried to have it serviced, but my regular "synth guy" did not find the issue.

Of course have no problem with any other synth (including weird modular stuff with debatable quality). I've tried everything, change channels, cables, DI, no DI, changing audio interface, etc...

I'm getting desperate...