IMO not much comparison the Tyros sax sounds better than the other but also no comparison between the Tyros and the real deal of Dexter Gordon.

I too have heard some guitar solos on keyboard that were outstanding and very believable, especially one like distoreted guitars etc. acoustics are a bit tougher I think.
Terry

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jam on,
Terry http://imjazzed.homestead.com/Index.html
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jam on,
Terry
http://www.artisans-world.com/