I just don't see the point of getting an MS to run Yamaha legacy styles into a legacy Yamaha XG soundset... Why not go out and get a used PSR (pre Mega Voice) for what, a couple of hundred dollars, tops, and sound just as good, and probably better?
And yes, if you thought that sounded as good as an Audya, you might consider better computer speakers...
The thing that puts Yamaha head and shoulders above the competition are the Mega guitars and basses, and the SA voice technology and well developed sounds for it. Live Styler into that XG soundset provides neither, and all you are left with is a 90's (early, at that!) PSR. The sad thing is, as an MS feature, this is what is getting MS arranger owners worked up, because FINALLY they at least have a decent pro selection of styles to chose from. Trouble is, you have to sound like an old PSR to use them...
Sounds like a rock and a hard place...