George,
My problem isn't really changhing the variation without hearing a fill, my problem is trying to do (for example) fill "B" and then "main" part "A".
Here's what you wrote about it: "The fact that you select one of the variations and you always get a fill in first would mean that you can't get away from a fill in for that part! I think an example would be if you are playing variation 1 and you hit variation 3, what you hear is the fill in for variation 3 before actually playing variation 3. Therefore, hitting variation 2 right after hitting variation 3, you will get both of the different fill ins."
Well, I don't agree with your argument all the way. The factory can program it any way they want even by having only 1 button for the main and fill-in. (though not programing to change variation without fill).
Maybe I agree with you, I just don't understand exacty on which point you were talking about.
Does the psr640, 540, or 9000 have the same problem?
Does anyone know of a way to get around it?
Did anyone hear from Yamaha about it?

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Jick