X2. I tried the LPB-1. Even when adjusting it for zero volume gain, when activated it had an overdriven sound. I wanted clean boost. EQ probably a good way to go. I opted for a volume pedal and really like it. I got the Visual Volume.
I also never got any distortion from mine.
I would guess your unit was faulty or your input gain was set rather high, causing the boost to push your amp to distortion.
