The 64mb isn't for samples. It's for (I think) stuff like Premium Packs that have additional voices and styles. But instead of being able to get a 2GB Simm and stuff many Premium Packs onto it (they are pricey though) you can only put one at a time on the S950.

I have to say that by creating this limitation, I feel a little dissed and annoyed.

I guess that whenever Yamaha comes out with these middle of the line arrangers they strategize on what to keep out so that people with $$ buy the TOTL model.

I suspect that next year when Yamaha comes out with the T4 replacement, the keyboard will have many more styles with audio drums. It must be labor intensive to only put them on 25 styles.