As far as I know, there are no sound modules comparable to the KN 6500 or the 9000 pro; the SD4 could (eventually) be released in time for the next Winter Namm or the Frankfurt Musik Messe (April 2002). By the way, many of the SD1 styles are the same as the X1. So I think that your best option is to try and get an X4.

[This message has been edited by Dreamer (edited 08-22-2001).]
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Korg Kronos 61 and PA3X-Pro76, Roland G-70, BK7-m and Integra 7, Casio PX-5S, Fender Stratocaster with Fralin pickups, Fender Stratocaster with Kinman pickups, vintage Gibson SG standard.