http://www.yamaha.com/clavinova
When used with the Clavinova CSP, the Smart Pianist App lets you easily record your performances and save them to your smart device. The multi-track song recorder function featured in Clavinova digital pianos allows you to record your performances with a single touch, which is useful when you want to review your playing objectively. Additionally, you can record up to 16 tracks for simultaneous playback, so different hands can be recorded separately -- or overdub parts with different Voices. With audio recorder, record performances to Smart Pianist App and create audio files* you can save and play back on a Smart device.
*Recordings are made in MIDI format, and can also be recorded to Smart Pianist App