I have a pedal board with a G30 wireless on it. Been using it for years issue free. Board is powered by a power supply without isolated outputs. I got a custom overdrive pedal made and here is what happens when cabled as described: - G30>Custom pedal = Noise/static. Not useable - G30>Ampeg Scrambler>Custom pedal = no static, but loud pops when turning the custom pedal on/off - No G30 - Everything works great. Silent operation Any ideas?