Ok, Em-25 seems a pretty kb, but I think it has only ¡1 mb! for sounds. Is it ok? Is it good with only 1 Mb?

I don't understand well the relative importance of Mb's for sounds... For example, PSR has 16 Mb... VA-3 has 8 Mb. So, has PSR a "twice" quality for sounds?

Va-5 has 48 Mb... So, must I think VA-5 sounds are much better than PSR-2000 ones?

And, perhaps it is important the number of sounds also. It is not the same 1 Mb for 100 sounds than 1 Mb for 900 sounds, does not?