Just bought this pedal, Model GCB-100. Tried it out on my practice amp Fender Rumble 100 w/PV Cirrus bass. Is it typical for this pedal to really suck the volume out of my rig when I kick it on? The battery is new, cables are new and in good shape. I had a EBS wah/one and it did not affect volume like this Dunlop is doing.