This is the rackmount two-channel version. A bit more versatile than the pedal and has an extra channel. I've used it both with my bass setup and with my band's PA and I'm sold on the sound. An overzealous buying spree accidentaly landed us with a second one of these, so I'm letting one go. Couple of minor scratches, but nothing major and both channels work perfectly. Asking $130 shipped in the U.S. Here's the link to the Aphex website for all the details on the 204. I'll post pics later today when I get a chance. http://www.aphex.com/204.htm Thanks! J.