the demos were nice. Been a fan of Petry Gilles for a while now. I dont know if there is any benefit in pairing the Kronos with the T4. The Kronos in that set up is virtually redundant. The only possible advantage i can see in using the Kronos with a T4 is if you wanted to use the Karma function live whilst accessing the SA voices on the Tyros and not the other way round as shown in the demo. As a live instrument , the Kronos has nothing over the T4 in terms of real world instrumnets. Its guitars are awful, its brass and wind instruments cannot compare to the T4 and its pianos definately have a darker texture to the brightness of the yamaha but thats just tastes. But in the studio thats where the Kronos would shine .