I can't help you with an iPad app, but my yMIDI app gives you a full MCU compatible control surface along with keyboard, MIDI controllers, and trigger pads. Windows 8 tablets are incredibly inexpensive, the HP Stream is just $80.
yMIDI beta is a public beta of the next release of yMIDI. This version includes a new control surface that emulates the MCU Pro as well as many bug fixes and performance improvements.
yMIDI is a general purpose MIDI controller for controlling MIDI enabled software or hardware that supports the RTP MIDI protocol. yMIDI communicates with compatible devices over wireless or Ethernet. yMIDI works out of the box with computers running OSX and with Windows systems running
rtpMIDI.
Features
Standard Controls: Pitch, Mod, Volume, Pan5 custom slider controlsX/Y control3 octave keyboard control4x4 grid of touch enabled padsCustom sliders, X/Y control and pads are configurable to any CC and channel*NEW* Control surface with MCU Pro emulation*NEW* Toggle mode for touch pads - Visual indicator toggles between touch events.
yMIDI beta is available from the Windows Store
yMIDI Control Surface
