Super Duper Clone from Two SHO Circuits?

[natron_mn]

I got a couple circuit boards based on the Rullywow SHO clone (link below) and was wondering how I would add the master volume control to make it a Super Duper? To my understanding, the Super Duper is just two SHO circuits with a master volume control, right?

Would I simply connect the output of SHO circuit two to lug 3 of the Volume pot, and then connect lug 1 of Vol to ground and lug 2 to the effect out of the second footswitch?

http://www.rullywow.com/build_docs/fo-SHO%20v1.1.PDF

[Redvers]

Sounds right to me.