Manuel,
there is no such a thing as a "plus card"; you just have to find someone with an SD1 plus who is willing to share the new sounds, styles and registrations.
For the rest, it's the same instrument as before.
Andrea
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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.