Akai Pro has debuted the MPC Fly (http://www.akaiprompc.com/mpcfly.php#) made specifically for use with an iPad 2. It’s a music production controller — hence, MPC.
MPC Fly has a multifunctional, double-hinged design gives you the flexibility to produce tracks anywhere. It also acts as a protective case between sessions and give you total access to your iPad 2 for normal uses. Contact Akai for pricing.