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master channel and FX return channels generate noise / coupler / hum

As the title says, I am hearing a fine beep like a discharge or coupling and if I raise the fades even more it is even louder, except when the inteval mute button is turned on. Someone with the same problem who has been able to solve it, I have tried changing usb cables, different connections to power, different preferences of ableton and still continues, which does not allow me to use the mixer normally.

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