An awful lot of imitative synthesis revolves around the PLAYER, not the sound. I've heard some amazing things by amazing players on old technology, and we have ALL heard someone make a T2's SA sax sound like a kazoo!

One of the main tricks with imitative sounds is to learn what your sound CAN'T do, and then don't do it! No matter HOW much you'd like to...

So a really good demo of say a sax sound on anyone's arranger usually involves playing to it's strengths, and avoiding it's weaknesses. Not exactly an apples to apples comparison, unlike Purgatory Creek...
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An arranger is just a tool. What matters is what you build with it..!