FX pedal for drum machines

[Schnork]

+1 for Boss BX, but the US made Mackie VLZ Pro are also nice. Two different flavours, so to speak.

Check this thread for some inspiration:

Boss BX-8 / BX-800 mixers

I have both and really love them. The sends are mono, but the returns are stereo. I use these mixers a lot. They are not clean sounding boxes, but if you turn up the gain controls, they distort the signal in a great way. Here is an example: [TECHNO // ANALOG RYTM & BOSS BX-8 (warning: high volume)]