RCA oscillator mod

Hi everybody, I have this RCA oscillator that I just restored to functionality and I am going to use it in my studio with my modular synthesizer.  I was wondering if there is any feasible way to create a control voltage input so I can modulate it . I got the idea when I found I could get really cool frequency changes by waving my hand various distances around the grid caps of the 6J7 tubes.  So I would like to get the similar effect with a control voltage from my synth.  Below is schematic,  any ideas?


Thanks,

For goofing-around, not precise, not gonna be 1V/Oct without massive processing. But not so unlike waving your hand at the grid lead.

Excellent!  Thanks so much, I will give it a try.
David

Hi PRR, I installed your suggested circuit and it works great,  just what I was hoping for.

Thanks again.