[sdiy] 1-pole LPF using a differential integrator?

[Roy J. Tellason]

On Thursday 01 May 2008 00:20, Aaron Lanterman wrote:
> On Apr 30, 2008, at 4:00 PM, rdrake wrote:
> > how about that center-tapped pot on the output?  would love to see
> > an alternative way of implementing that...
>
> What did you have in mind?
>
> Indeed that is an interesting feature - I don't think I've seen
> another synth with something like that.
>
> I recall the Buchla 258 - I think - has some FET based circuitry that
> lets you crossfade between a sine and a whatever-other-waveform -
> maybe something like that could be used here to make it voltage
> controllable.

I've been wondering if it were feasible to use FETs like that...

That's one of the reasons I posted about that "simple VCA" a while back.  
While a regular VCA seems to carry lots of requirements for typical synth 
applications,  I'm thinking more along the lines of volume controls, 
cross-fading,  and other such stuff that should be do-able without getting 
all that complicated.

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