I guess bottom line is, have you ever heard an arranger with better guitar style parts than the T3/S910?

Because, if you haven't, those are some incredibly talented programmers and arrangers doing that programming. And I hate to say it, but if THEY can't make guitar styles up to your standards, it is quite possible that NO-ONE can, given the sounds and the technology you have. In truth, there's a REASON the Audya went to audio loops for guitar parts. Because it simply is not possible to do it as well in MIDI. If it could, do you think they would have gone with such an expensive solution?

The reason that SMF's occasionally (very occasionally, IMO!) get a better guitar sound is that, the part is the part... It isn't expected to play any chord, any voicing. It simply plays what it IS. Put the same file in an arranger as a style part, and you will quickly see how the NTT messes the whole part up, how different chords get messed up an un-guitaristic. It's a non-linear instrument, with weird rules, being played by a robot with the wrong rules, into sounds with a fraction of the expression and nuance a real guitar gets.

To be honest, I am astonished at how WELL the Yamaha's get it, considering all that. But if that isn't good enough for you, Henni, well, best of luck with your quest... You ever succeed, let us know..!