The makers of the iOS guitar interface adapter iRig are now releasing the iRig MIDI, a compact standard Apple Core MIDI interface connects keyboards or other MIDI-compatible instruments such as drum machines, drum pads and pedal boards to iOS devices. The company also announced SampleTank Free which is included with the iRig MIDI, as well as the full version of SampleTank for iOS -- an app that offers up to 400 instrument sounds, four voices and 900 rhythms to MIDI-compatible equipment.