Variable ramp generator

[jhaible]

> I know, it is possible to independently control the charge and
> discharge times in integrator by using a pair of diodes or
> a CMOS switch. AFAIR, Juergen described such operation of KORG
> LFOs. The problem is if one applies this control scheme to VCO
> it leads to severe tracking problems.

No way to use this Korg circuit for a tracking VCO. (Schemos are
on the web somewhere, btw.)

I remember Don Tillman once offered an idea how it could work,
but I've never tried it or followed it further. Don ?

JH.