I've just stumbled on an amazing site that does sounds etc for the Tyros (hopefully the Tyros 2 as well). Each sound has an MP3 file to demonstrate it and there are loads to listen to. Normally I've never liked Yamaha keyboards but having played the Tyros 2 for 6 hours 2 weeks ago and now hearing sounds on this site, which are the best I have ever heard from any keyboard, I think I am finally converted - WOW, brilliant stuff.
Take a look at the link http://www.cd-soft.de
Click on Tyros then custom voices and follow links, enjoy.
PS Nice forum by the way and brilliant Yamaha links on here, keep up the good work.