Having an odd problem, hoping one you more technically-minded people may have an idea. My current setup uses a large bypass looper that has an insert for the volume pedal. I use a Moog expression pedal as a volume pedal, works fine. But lately, for some reason, if I have the channel with my Boss MD-500 active, anything below the maximum volume on the volume pedal has a nasty hum. All the way up? It's quiet. Go down just a bit, the hum/buzz appears. It doesn't seem to happen with any other pedals. Any ideas?
