IK Multimedia iRig MIDI Interface for iPhone, iPad-iPad2 & iPod Touch

"iRig MIDI is an ultra-compact standard Core MIDI interface for iOS that connects any MIDI compatible device to the iPhone

Specs

iRig MIDI Specifications
Standard Core MIDI interface connects any MIDI hardware device to Core MIDI-compatible apps
Directly connect MIDI keyboards, synthesizers, drum machines, drum pads, pedal boards and more using the included 2 x 5.2' (1.6 m) MIDI 5-pin DIN cables
3 MIDI ports: IN/OUT/THRU
2 LEDs for MIDI IN/OUT activity display
Micro USB port can charge the iOS device while in use
Compatible Devices

iRig MIDI is compatible with iPhone 4S, iPhone 4, iPhone 3GS, iPod touch (4th and 3rd generation), iPad 2 and iPad. They all require iOS 4.3 or later.

iRig MIDI is the only compact iOS MIDI interface sporting 3 MIDI ports: IN/OUT/THRU. These connect to any standard MIDI jacks using the included 2 x 1.6m/5.2' cables. iRig MIDI also has 2 LEDs for displaying the MIDI activity on the IN and OUT ports.

Features:

Standard Core MIDI interface connects any MIDI hardware device to Core MIDI-compatible apps like SampleTank FREE and GarageBand®
Directly connect MIDI keyboards, synthesizers, drum machines, drum pads, pedal boards and more using the included 2 x 5.2' (1.6 m) MIDI 5-pin DIN cables
3 MIDI ports: IN/OUT/THRU
2 LEDs for MIDI IN/OUT activity display
Micro USB port can charge the iOS device while in use
Free apps included*: SampleTank FREE* the powerful sample-based sound module app and iRig MIDI Recorder FREE*