Roland's JV-1010 64-Voice Synthesizer Module may look small, but it sounds huge! That's because this half-rackspace wonder includes the full sound set of Roland's highly acclaimed professional JV-1080/2080 sound module, plus all of the sounds from the "Session" wave expansion board and a slot for installing an additional Roland's SR-JV80 Series wave expansion board of your choice. That means a staggering 1,023 high-quality Patches right out of the box, and over 1,200 Patches when expanded!