This app is free for the fourth octave only. You can check if the app works with your devices and than buy all the octaves via an in-app purchase.========Do you just want to play the piano and read sheet from your iPad at the same time? Than this app is exactly right for you. CoreMIDI keyboard support: Support for different velocities Pedal support Multiple sounds for different velocities; sounds awesome! Background multitasking support, so you can read sheet music from a PDF viewer while you are playing!Connect your keyboard via the Camera Connection Kit and play along!Have fun.