And, to be honest, the SA sax is NOT the 'best sounding' sax out there...
But it IS the best PLAYING, and the only one with any degree of realism once you actually PLAY a line. Which, in my book, makes it the 'best'.
The degree of legato control you have in your technique can go a LONG way towards making sax emulation with non-SA saxes more believable. But most of the time here at SZ, I hear everybody making the same basic mistake of holding a note fractionally too long while the next one starts. A sax CANNOT make more than one note at a time, but the slightly long release time (to prevent single notes chopping off unnaturally) causes great problems when playing a legato line. VERY fine control of legato can make this less apparent, but it's never totally successful.
The SA saxes are the only thing that change this note off behavior depending on how you play. All automatically, you just play... It's amazing to hear.
One can only hope this isn't patented technology, and eventually Korg and Roland (who we see have something like this in the pipeline on their Atelier organs) can incorporate it on to the already excellent SOUNDING (but not playing!) sax sounds...
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An arranger is just a tool. What matters is what you build with it..!