I messed with it tons the last few days using a few different guitars. I played it through a fender Hot rod deluxe.
I really started liking it for what it is, a 60's 70's overdrive that sounds like an old Marshall. Once I stopped expecting high gain I loved it. So versatile and cleans up well. Great tube like warmth.
Tonight after a while I tried something else. I turned the volume of the pedal up an the gain way down. Basically I had a nice slight breakup, maybe a touch more than that. I plugged a BBE crusher set to normal high gain sound into the zvex. Wow! It was like my Marshall was cranked. Warm fat and with the BBE it was a nice distorted sound. This thing is sweet!