Inside the Nitro module you'll also find valuable extras. The built-in learning features, sixty play-along music tracks, and an onboard metronome allow you to improve your skills. There is even an advanced sequencer and a performance recorder to expand your music-making potential. In addition to the USB MIDI connection for use with computers and mobile devices, the Nitro module also offers up some old school MIDI In and Out jacks so you can hook up to your favorite MIDI-equipped drum machine, sound module or other audio gear. There is a headphone jack for private practice, plus stereo outs to connect to a PA system, amplifier, or recording console. The stereo aux input allows you to jam along to your favorite tracks on your CD or MP3 player.