If, for whatever reason, the tons of voices in the W-synths are not enough for you, Then try adding one of Yamaha's four voice expansion boards to your synth. Each one adds 4 megabytes of voice memory. There is only enough room for one of the boards at a time, however.
Installation is easy.
You simply remove the cover plate on the underside of the synth to access the expansion board slot. From there, it's just a simple matter of lining the expansion board up with the slot, and carefully plugging it in. Great for live performances, as well as studio work. Features driving bass sounds, cutting guitars, and top quality percussion sounds. Includes a demo disk to show off the board's capabilities.