where'd my bass go?!

I think doug meant the big muff not the bass balls. The bass balls is an envelope follower that has the ability to have distortion on it. The distortion really isn't usable as a distortion pedal but more a weird effect pedal. I have a big muff and a proco rat and am still w/ the big muff. That was the first one i bought and have tried others but always went back to it.
 
If you can find one at a store, try out a Tech 21 ACOUSTIC DI. The mic/spkr emulator circuit is the same as the one in the Bass DI but is controlled by the MIDRANGE knob and leaves your low end relatively unaffected. I love mine. Certainly something to consider.