Alesis DM Dock Drum Module for iPad. I remember the D4 from the 90s very well. This is the 2012 version. =)
* The only drum module for iPad and iPad 2
* Works with virtually any app including GarageBand
* 13 individual 1/4″ TRS trigger inputs for connecting drum and cymbal pads and other triggers
* Works with dual-zone drum and cymbal pads, continuous hi-hats, three-zone rides, and multiple chokeable cymbals
* Hinged door completely encloses and secures your iPad
* Mounts to any stand or rack using the Alesis Module Mount (sold separately)
* 1/4″ Headphone jack with volume control
* 1/8″ Mix Input for mixing in external audio sources
* Balanced 1/4″ stereo main outputs for connecting to an amp or PA
* MIDI input and output for connecting to external MIDI hardware
* USB MIDI port for use with MIDI software applications or your Mac or PC
* Powers and charges iPad using universal wall power supply
* Assignable footswitch input for program changes, start/stop sequences or metronome