For your info a short impression what we can expect of the compatibility with other Yammies
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(Quote & Google translation from German)
'The PSR-SX900 can open files from Genos and Tyros keyboards, including registrations. After my personal experience (H.Dolde), many registrations are accepted without amendment.For the first time in the history of the Yamaha mid-range, there are three right-hand right-hand right-hand voices, which to me represents one of the most important innovations in the PSR middle class. Because that's musically more possibilities, and the compatibility with the top models is much greater. The PSR's punchy speaker system may make small adjustments here and there in the mixer to take drums and bass back in the bass via the EQ. Weaknesses show for me only in the wind and clarinet area, as in the predecessors also. Sometimes they sound a bit thin and sharp, which may have something to do with the reduced Wave Rom memory compared to a top model. But the sharpness you get in the mixer usually under control, when turning the heights in EQ back a bit. By mixing with similar-sounding instruments you can create fuller sounds. The PSR-SX900 does not have Ensemble Voices like the Genos or Tyros5. When you open such a registration bank, no voices are called, and you only get a "--------" message instead of the instruments. All in all, I'm very surprised at the high level of compatibility - even with styles that have been linked to registrations in the revoicten state'
(Source: Heidrun Dolde, DE)