Alesis DMPRO Drum Sound Module Rack unit.  Used in good condition.   

The DM Pro Expandable 20 Bit Drum Module is the most advanced electronic drum and percussion device available today. It surpasses the capabilities of what you expect in a drum module by offering features like 64 voice polyphony, a massive drum and percussion library that includes over 1,000 sounds, and open-ended expandability that lets you bring in new sounds whenever you need them. For composers who need a dedicated MIDI module for drums, or drummers looking for the professional solution for triggered electronic drum performances, the DM Pro represents the most powerful tool for creative inspiration. Designed to accommodate nearly any musical style, the DM Pro offers 1,024 different kick, snare, tom, cymbal, hi-hat, percussion and special effect samples. You can create and store up to 32 virtual drumkits, and each kit can contain up to 64 different drum sounds so the right drum is always available when you need it.

The DM Pro has 16 fast trigger inputs for drummers using electronic pads or triggered acoustic drums, and provides six independent audio outputs so that processing of levels and effects for discrete sounds is easier than on any other Alesis drum device. Plus, the DM Pro's customizable onboard multieffects use the same processing engine as our top-of-the-line multieffects device, the Q20. Its expansion slot lets you pull in new sounds anytime you need them. Since the PCMCIA-format cards store up to 8MB of memory, you can simultaneously access a massive collection of 24MB of sounds. Plus, the DM Pro is compatible with Alesis' Sound Bridge sample management software, so you can burn your own sounds and samples to a card for customized sounds. Also, the DM Pro's stereo audio inputs on RCA connectors allow external audio sources, like CD Players or tape decks, to be routed through an audio system so drummers can practice along with recorded music.