Thanks, that makes sense. I’m not confident in it being exponential.
When I started thinking about this, in my head I used 3 x 3 with 2 cables.
Put another way, I was surprised that this routing works on this synth, and it’s what lead me to exploring it further:
That patch makes some crazy noise, but it’s cool for drones. Note that if you change the amount, they effect the sound. In Osc2 you hear the effect of Osc1 modifying itself 3 times, and if you take one away you get a different timbre.
Pretty amazing synth they made 
Best regards,
Gino