Roland's V Accordion

The accordion isn't an instrument you might think would lend itself to the digital realm, but Roland has worked on developing a system of air-pressure sensors (they call it Physical Behavior Modeling, which sounds like something else entirely, but never mind) to allow the same type of play as the real thing, and have modelled the reeds within the instrument that are usually a pain to adjust. You also get the ability to play a range of non-accordion sounds and (using a footpedal) connect to sequencers and other stuff via MIDI.