I could get a yamaha portable keyboard with MIDI ports or a you rock guitar. I believe the iRIG midi works with you rock guitar without the camera kit. And I don't know if a MIDI to USB works with the iPad via the camera kit. Question is do all iPad music apps like GarageBand, MusicStudio, SampleTank, etc... support both of these devices or have they made the choice for me? I heard about core MIDI but I don't know what all that means for yamaha and you rock guitar sending regular MIDI. I found a description in an app that indicated the app is compatible with core midi supporting midi keyboard. So then not all midi keyboards support core midi???