Audiobus: Use your music apps together.
What is Audiobus? — Audiobus is an award-winning music app for iPhone and iPad which lets you use your other music apps together. Chain effects on your favourite synth, run the output of apps or Audio Units into an app like GarageBand or Loopy, or select a different audio interface output for each app. Route MIDI between apps — drive a synth from a MIDI sequencer, or add an arpeggiator to your MIDI keyboard — or sync with your external MIDI gear. And control your entire setup from a MIDI controller.Download on the App Store
Audiobus is the app that makes the rest of your setup better.
Karaoke and minus one - Roland Cube Jam app & Cube Lite amp
Play back commercial songs and minus-one tracks through the CUBE guitar amplifier and riff along for hours. The app also includes great tools for music practice, including independent speed and pitch adjustment of audio playback, Center Cancel to remove solos and create your own jam tracks, mix down...
Cube Jam app (FREE) - https://itunes.apple.com/us/app/cube-jam/id585464498
Cube Jam & Cube Lite