Thank you very much.That I do not know, my explanation was on sampling in general.
It should not really matter if one is greater than the other since it is more than bit rate that determines how good the tone of the sample concerned is.
You have a tough choice to make.
I cannot advise any further on the features and capabilities of any Yamaha model, I simply do not know enough about them to give advice on the Pros and Cons of each model you are considering.
You'd given me a ton of information.
Considering several factors, Yamaha PSR S 775 would be the one for my purpose.