Note the following description does not mention the iPad, however I am assuming this will work with it as well:
"Simply plug your electronic instrument (synthesizer, guitar, whatever) into iConnectMIDI and you can play and control your music, using your iPhone or iPod, your instrument, or both at the same time.
You’re not limited to one musical instrument either. With iConnectMIDI you can connect up to 16 devices in a chain, controlling all of them with your iPhone or iPod Touch.
ConnectMIDI’s USB port allows you to plug a USB-enabled electronic instrument into your iPhone or iPod Touch. Put on some headphones, load up an appropriate sequencing app on your phone, and you have the perfect mini-studio for travelling.
The USB port also allows you to plug your instrument into a Mac or PC laptop via iConnectMIDI.
Rugged and Portable
Your iConnectMIDI device is compact and tough, roughly the half the size of a paperback novel. With its brushed metal casing it can take a beating on tour, and its rubberized feet keep it from sliding around on stage or on your desk."