The ax7s give you much more gain. I replaced one of the ay7s in my Muff’n with an ax7 and at got a lot crunchier, and much darker. I found that for very heavy sounds, setting the gain knob to noon gave me more then enough. Anything else got noisy.

I’ve only had it in there for a little while though. I haven’t really seen everything it can do with the new configuration.