I recommend syntaur...Love these guys..Sam Mims is awesomE!..
from their website:
"Syntaur was created in 1988 as a third-party developer of sounds for Ensoniq keyboards. The company quickly gained a reputation for expert programming and top-notch customer service, and soon became the world's largest source of sounds and accessories for Ensoniq keyboards. Through exclusive licensing arrangements with Ensoniq, Syntaur has kept the factory sound libraries for long-discontinued keyboards available. In fact, we have in stock virtually every library that Ensoniq has created - back to the very first Mirage disks. And all of our sound disks carry a lifetime guarantee - we'll replace a floppy disk four years from now, even if your dog chews it.
In addition to our own products, we have been contracted by both Ensoniq and Korg to develop many of the on-board factory sounds when they have created new keyboards. You've heard our sounds in the:
Ensoniq ASR-10 and ASR-88
Ensoniq KT-76 and KT-88
Ensoniq TS-10 and TS-12
Ensoniq Soundscape PC Sound Card
Korg Triton Expansion Boards
Korg TR Rack " http://www.syntaur.com
I have an ASR-10 rack which I bought an SCSI Hard Drive/CD-ROM combo from and it works perfect!
...I got it on Ebay from SynthPlus
...I have bought other stuff from this guy, and he is awesomE and really knows his ensoniq stuff as well! http://stores.ebay.com/synthplus