The recipe is, in short, a button group which is the supercontrol of your transpose knob. Anyway, you can study this example all you want. It's got some great features that you might not have thought of, particularly:
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The button-group supercontrol is selected as "Hide in Performance."
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The button-group supercontrol has "buttons are send-on only" for subcontrols selected
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The button-group supercontrol uses Bounce Back to First Value, but since the buttons can be ordered arbitrarily, it's the 0 transpose (that's pretty cool).
Page
http://mididesigner.com/qa/?qa=blob&qa_blobid=17373212701313115270
Screenshot
