Standard guitar? I presume that you mean a guitar you play (as opposed to Mega voices, that are better left to program)?
The SA guitar in the S900 sounds about the same as the T2's (Ian will let us know if they are identical!).
Personally, I don't give a hoot about what you CALL the sounds. You just PLAY them, and that's what they sound like. And, sorry Bill, but those Yamaha voices DESTROY that Wersi patch, IMO. No VSTi's, no loading them in, no changing the registrations to address them, and, AFAIK, there is no SA technology in the Wersi, is there?
That whole ability for the engine to analyze whether you are playing legato or staccato, and change the samples accordingly is what makes the SA voices so realistic. And I don't care if you call them 'Standard' or SA, they are all ROM sounds. No loading, no nothing. I AM presuming that the 'Standard' Wersi guitar is a ROM sound. So here we have a direct head to head ROM sound comparison. To my ears, we have a clear winner.
At one tenth the cost.
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An arranger is just a tool. What matters is what you build with it..!