I have a pedalboard with the following: Sansamp BDDI EBS Compressor EHX Holy Grail reverb Boss Bass Chorus I have been using the above for a while with batteries. (except for the Grail, which doesn't have battery power) The only problem I've had is the cost of replacing batteries. Someone suggested the OneSpot power source, which I purchased last week, along with the nifty daisy-chain connector cable. Now I have a noisy ground-like hum no matter what bass I plug in. The noise goes away if I touch the tuners or bridge of the basses. I have tried: 1. Plugging the One Spot into several different AC outlets and connecting basses to pedalboard - hum 2. Plugging basses directly into amp - no hum, so it doesn't appear to be my basses. 3. Plugging basses into each pedal individually, with battery power only, and into amp - no hum, so it doesn't appear to be any of my pedals. Does anyone else use this power supply? If so, is this just a defective unit, or is it what I have to live with if I want to power the pedals with AC? The AC transformer on this thing is 2-prong, not 3, and neither of the prongs are wider than the other, as most plugs are today. Is that what might cause a grounding problem? Any replies or tips are appreciated. Thanks!