Abacus...

What Diki is talking about is what Yamaha call the 'Groove' control, it does seem to be missing on the latest models, here is Yamaha's discription of the feature

'The Groove function allows the modification of note timing without changing the melodic content of a style. In other words, this feature can modify an 8 Beat Pop Style with a Reggae or Swing groove. In effect, the Style is transformed in to an 8 Beat Reggae Pop Style'

I agree with Diki that it was a useful feature in that you could greatly increase your internal style count as the groove results were savable.

Perhaps as styles have now become so complex and the available styles have increased in number it is not considered so important.

Noel.