Although musicians were quick to pick up on the iPad's possibilities as a control surface, the audio production corner of the App Store is still overwhelmingly devoted to things like guitar amp models and soft synths -- that's because until recently there was no way to send MIDI commands from iOS (not that some folks didn't figure out workarounds). That's why we were excited to hear about the appearance of MIDI APIs in iOS 4.2 . What does this mean for all of you would-be Brian Enos? The gang over at Create Digital Music have put together a handy guide to what we might expect from a world where all out iOS devices can communicate via MIDI, whether through the USB cable or over WiFi -- and it is a brave new world, indeed. Intrigued? We were too! And we were pleased to find out that yes, the M-Audio Uno works with the iPad, and that the accelerometer can indeed be used to pitch bend. Unfortunately, we also learned that the Line 6 MIDI Mobilizer is a lot less exciting than we thought it might be (that is, until third party devs go to town on the thing). Hit the source link for all that stuff and more. Or just peep the video after the break, if you wonder what the next version of Pianist Pro holds.