I'm sorry I missed your question on this topic. I've been away off and on with school.

I never have had issues with the poly because I tend to record one track at a time in Cubase anyway. I have used the CS6x in a live band and never had any probs then either. If you add PLG expansion boards they increase the poly as well.

I don't know what sort of sounds the 9000 has, but I can say that it's better for trance than the PSR-3000 in my opinion. I mean, the CS6x was created for this type of music!

Feel free to e-mail me if you have any questions.