Line 6 Helix Stadium Talk

I don't know if this is possible, and suspect to pull off what I'm trying to accomplish, I'd need two expression pedals, but here is what I'd like to be able to do:

We're doing a version of Romeo's Tune. I'm running a GM-800 through a return on the second path. I have a volume pedal set so I can alternate between just acoustic guitar and guitar and organ from the GM-800. I also have a rotary set to turn on when the volume pedal reaches a certain point. The pedal is also assigned to control the mix. What I would love to have happen is that the volume reaches full at the same point where the rotary turns on and, after that, volume doesn't increase but the rotary mix does.

Is that possible?
 
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