The serge Ring modulator have this feature as well.

Best Regards,

Josue.

> Just remembered, the Buchla 285 balanced modulator does this. Any
>
> others
> > > got me thinking about the Nord Modular's ring modulator.
> It has
>
> > an
>
> > > additional control that varies the modulation from ring
> to AM to
>
> > > none, which can also be "voltage" controlled.