http://media.roland.com/en/IT/MicroBR_IT/index.html
Meet the ultimate palmtop recording studio. Only slightly larger than an iPod, the tiny-yet-powerful MICRO BR is dream for musicians on the go. The MICRO BR offers four simultaneous playback tracks (plus 32 V-Tracks), an SD Card slot, onboard multi-effects, built-in rhythm patterns, a tuner, MP3 compatibility, USB, and more. No guitar case or gig bag should be without one!