How to manually sweep a phaser?

Which control parameter would that be? I see just Rate, Depth, Feedback, Frequency, Start Frequency, Mix, Level, Balance, and Bypass as being the modifiers.
 
I may have to eat my words. Now that I'm home and in front of my Axe III, I don't see a way to manually control the Phaser sweep. I really though there was a hook for that.
 
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