Roland AX-Synth

The AX-Synth is a sharp-looking 49-key strap-on synthesizer. It runs on batteries (or with a power adapter), and while it only has a handful of on-board sounds, it has a boat-load of ways to control them, so playing the AX-Synth is a real blast. You can also use it as a MIDI controller, if the on-board sounds are too limited.