Weird noise coming from prophet all of a sudden

[musicprohead]

Hello All I am getting this weird noise from my prophet rev 2.
I tried changing cables nothing.

I am running an RME Fireface UFX. I even swapped inputs with my OB6 and the same thing happened, so it's not an input issue. Even when the unit it turned off, it makes that noise.

[musicprohead]

Noise went way when i unplugged it

[shiihs]

I suspect a USB ground loop. It's an annoying problem of USB midi. If you happen to have a laptop connected to the synth, try running it on battery instead of power supply and see if the noise disappears.

[thickravioli]

Hello All I am getting this weird noise from my prophet rev 2.
I tried changing cables nothing. doodle baseball

I am running an RME Fireface UFX. I even swapped inputs with my OB6 and the same thing happened, so it's not an input issue. Even when the unit it turned off, it makes that noise.

I think this problem is due to usb midi. try connecting to a synthesizer and try running it on battery instead of mains and see if the noise goes away.