99% of whether a sax sound is good is the playing. Phrasing, evenness of touch (horn players, unless going for the effect deliberately, do not jump in volume from note to note, but keyboard players have a hard time hitting every note almost the exact same velocity), ability to make phrase ends quieter than phrase starts (horn players run out of breath!), all of these make a radical impact on whether a solo is believable...

I must confess, I'm not too enthused about that Wham! solo. For starters, it sounded like he was playing an alto sax down in a tenor sax's range. Then you have to take into account that this is a BK-7m. Not a BK-9. No switch enabled up glisses like the SA saxes have. But the BK-9 is supposed to have some of this kind of stuff.

For now, I'd be waiting patiently for them to hit the stores, and for Roland to release their usual top quality demos. We have seen neither, yet...
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An arranger is just a tool. What matters is what you build with it..!