Actually I have a Bitrman, and it does have quarter-inch inputs and outputs, and actually has an input gain knob which when you crank it up a bit, can take in instrument level just fine. I use it with my bass all the time. Great unit. The only real problems with it is that it doesn't have a stomp switch for bypass, just a plastic button (whatever, I step on it anyway), and it has funky power requirements (9VAC).
Also, +1 on the WMD Geiger Counter.
The Devi Ever Bit is actually just a really gated fuzz, but can cop the 8-bit sound pretty well.