Forgive my ignorance, as I've just bought the px5, is it possible to play wave files of a recorded acoustic guitar, save them as phrases, and play them back using a key to trigger them. Or does the USB just playback audio recorded onto it directly from the px5. I've managed to get the USB to playback midi so I know the USB stick is working, and downloaded new stage settings, just wondered if it was possible to do this with audio files ? Many thanks for any assistance on this