gTAR Midi Electric Guitar by Incident (Kickstarter) works with most Midi Software and has been tested OK.

Cables, Powersupply and iPhone not included

Specs

Size: 35"L x 13" W x 1.75" D

Connections: USB, 1/4" Line Out, SmartPick Power: Internal 5000 mAh Li-Ion Battery, Charging via. USB

App + gTar Compatibility: iPhone 4/4S (app + gTar)

gTar Hardware Compatibility: Any CoreMIDI/USB-MIDI enabled device (includes other devices running iOS 5, Android, and Mac OSX)