I don't think the PSR-S910 styles will work at all on the S900...it is using the new Guitar Mode, as does the Tyros3.

There were conversions of the T3 styles to T2/S900, and they were okay, but, in my opinion, not outstanding.

I suspect S910 to T2/S900 conversions will be similar.

You will be able to play S900 styles on the S910, and perhaps it will also play some of the Tyros3 styles.

Won't know for sure till I get one.

Ian