Hey guys, I just put my first pedal board together and I have a problem. here is what I have in signal chain order: EBS Multi Comp Joyo Ultimate drive Joyo Classic Chorus Zoom B2 I was hoping I could power all that with an I-Spot power supply But here's my problem. All pedals are relatively quiet except for the Zoom B2. It creates this high pitched background tone. Almost like an A440. I moved the power cables around, tried different configurations, nothing. The only thing I could do to get rid of that tone was to hook the Zoom up to it's own power supply. I really wanted to just have the I-Spot. I don't like having all of the cables cluttering up my space. Do you guys know what the cause for this could be and if there might be another way to get the Zoom to stop doing that ?