I have a Casio PX-850 that I recently purchased for my daughter. My question is; can you playback a list of MIDI files from USB. I can only seem to get it to play one at a time then I must manually select the next song. I would like to use the piano to play music, unmanned, continuously at parties. If not USB then can a list of songs be programmed to play automatically from an iPad as a controller? Thanks for any information you can provide.