It's going to be hard for me to judge how improved the T4 is over the T3, as I never got to play that either!

I'm afraid from simple LISTENING, it's harder to tell than you might like, Ian. Naturally, one would expect ANY arranger to be an improvement over its previous model, but to us non-users, the issue isn't quite as black and white as those far more familiar with the sounds would feel.

The new brush kits sound great... so apparently, Yamaha ARE responding to this, albeit a tad slower than I would like. Maybe the T5 will have TEN totally new drumkits, and that issue can be put to bed once and for all..?

My major props go more to your style creators than to the instrument itself. They are an awesome bunch of musician/programmers, and every other arranger manufacturer should learn from Yamaha's example. They honestly, to my mind, make the difference between the Yamaha's and the 'also-rans' than anything sound or OS wise...