cgiles, you might try just using a regular breath controller with the T2. The SA sax already seems to get legato/staccato right, just add the breath controller for volume/filter adjustment and you might get pretty close.
I'm also a HUGE fan of the KX5 remote controller - although it's MIDI is primitive, that pitch bend strip is to DIE for for doing scoops, trills and bends, and it has a breath controller input....
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An arranger is just a tool. What matters is what you build with it..!