I bought an isopump to supply the DLS on my board with 18V to try to get the fatness and headroom. I tried it with my pedalboard with the rest of my gear in a godlyke daisychain. However there was a huge amount of hiss coming from my church sound system. I couldn't diagnose the problem till I got home and realized that it was the iso pump. The hiss level dropped when i bumped it down to 12V, and when i totally removed the iso pump from the daisy chain, there was lil-no noise. Then I tried isolating just the pedal and the isopump removing all the other pedals and it was silent.. so it's not an issue with the iso pump but the way it interacts with the rest of the daisy chain. Do you have any advice how I might try troubleshoot the problem? thanks guys.. =) much appreciated!