I have a problem with a sharp popping noise when I go to change presets on two devices. Let me give you the gear list and how its connected: Bass into ADA MB-1(effect loop A) into RNC compressor into Alesis Nanoverb into BBE Sonic Max into Line 6 Bass Pod Pro. Effect loop from Bass Pod Pro to floorboard containing Fulltone Bassdrive into Boss OC-2 into Akai Headrush back into Line 6 Bass Pod Pro. The Ada and the Line 6 are linked via midi cable to switch presets together. The crossover outs from the ADA are sent on to a QSC 350 watt(x2)power amp to a Hartke 4x10 top and an EV 15 bottom. Whenever I switch the presets(via a Line 6 FB4 switch, connected to the Bass Pod) I get a blasting POP! How can I get rid of that noise?