Jonny,

I think the T4, much easier to get to where you want to with the songbook and the menus, the T4 styles are endless and much better than Audya, don't get me wrong the Audya has some hellish good sounds but the T4 will allways have much more going for it, Yamaha can pour money down the drain at T4 if it needed to. You only need to look at the price difference and the number of demos on Youtube to see which is TOP OF THE POPS.

Jonny I forgot which KB are you driving at the moment?

Tony