[sdiy] linearize OTA for VCF?

[jh.]

> > The way I got around this in my VCA design, which uses the CA3280 with
> > diode bias activated, is I set the gain levels so that the OTA clipping
> > point coincides with the output buffer reaching the power supply rail.
> > You're going to clip there anyway.
>
> That's a good tip, thanks.

OTOH, clipping from the rails might be one thing we want to avoid by
using soft clipping stuctures in the filter. If a strong harmonic hits
a high Q resonance peak, any fast limiting might be better than
an opamp output which gets stuck at its rails for some time.

JH.