I read in the brochure that when you use this card in a Fantom X6/X7/X8 in Piano Mode, it shows another display page with all the sound tweaking options, kind of like in a VST. Must be awesome, I wonder how much of a difference that would make. Maybe that's just a graphical way of calling up the same patch variations that you are showing starting at no. 51...
this was always the most expensive back when i was collecting them at their low point. back when JD-990s with the synth cards installed were going for 300 to 400 on ebay. i had all SRX at one point but now i have Integra 7 and sold all my other roland rack units and the cards.