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