Here is my setup, Musicman Bongo 5, Demeter HBP-1, QSC PLX1602, Korg Rack Tuner. All plugged into Furman Power conditioner. My problem is that I get little spikes that appear to be in my input chain where there is a loud hiss for about 1 or 2 seconds. This seems to only happen in Church. I"ve changed cables, plugged my power conditioner into another power conditioner and it's still happening. I thought it was power related but none of the other instruments are having this issue. Could it possibly be the tube in my Demeter? Any ideas would be much appreciated. Thanks.