I'm running a Mutron (true bypass via Lingenberg Sound) through a beater Twin at a rehearsal space. When the pedal is activated with the amp volume at 6 the pedal sound is distorted/horrible and unusable. If the Twin volume is dialed back to 3 the Mu sounds great. This doesn't seem right...or is it normal? Why does the amp volume have so much impact on the ultimate sound of the Mu? Thanks!