"Styles across all models will sound very similar, because these often use XG only voices and have to be compatible with Yamahas sff or style file format. This means though that you can take a style from a 540 and use it on a 9000 pro, and vice versa. Hence why you may not hear such a significant difference between models in this range."


Which is exactly Uncle's Dave point: Common XG voices! and if patterns use the XG voices, no wonder when I tried the patterns I liked in PSR740 in PSR9000PRO, they sounded IDENTICAL... I mean not similar but IDENTICAL. That means that PSR740 is an excellent keyboard and PSR9000PRO is