Tom, maybe it's not a bad idea to check what real users think of the SRX 02 expansion board (of course once you are there, you can check other instruments as well).
http://www.harmony-central.com/Synth/Data/Roland/SRX-02-Concert-Piano-Wave-Expansion-Board-01.html
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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.