Korg PlugKEY (simple MIDI-IN and Line OUT via iOS Lightning)
Just stumbled across this...
http://www.korg.com/uk/products/computergear/plugkey/
Looks like a great way to hook up older gear to iPad. Bit of a shame it isn't able to power USB MIDI controllers
Comments
+1 for the Korg Plugkey
Simple, quick, clean audio, plug and play and works great with older gear: