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    Ground loop hum? How to identify?

    Hello, ch #1 is silent, 2 & 3 have a hum all the time. If I plug straight into the front of the amp, no hum. Didn't have the hum before the RG. Same pedals and power. I can unplug the power supplies, still a hum. I can disconnect the fx loop, still a hum. If I unplug the ch. switch cable...
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    Volume drop in Audio loops 1-4 only

    Hello, I have a large volume drop in Audio loops 1-4 only. I have tested all of the following and they are 100% functional: any pedal I try the cables the power supply I have moved the same pedal and cables to other loops and they work fine. I have removed all the pedals but one, still...
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