This version successfully uses the one knob to dial in amounts of the Sub oscillator or the tuned to a 5th above oscillator. But I reread the manual for this section and it reads to me like there should almost always be signals from both of these oscillators. I plan on making the knob produce ratios between the two.

This version still sounds pretty good. So, use this if you like the sound of only the Sub or only the 5th. The one knob will produce levels of either or.