[sdiy] Spice/mathematical model of SSI2164

[Liam]

> That could be a problem as you would lose the benefit of the
> performance of the NPN transistors in VCA2 during the positive half
> cycle.  It would be better to treat this as a black box with a
> negative current coming out of it - for example it could easily drive
> a sawtooth oscillator.  Or feed that into an op-amp I-to-V inverter
> and then into the classic triangle VCO.

Thanks, noted.

I will pursue one of those paths instead then!

Cheers, Liam