[sdiy] all analog FM synthesis?

[Mattias Rickardsson]

At 12:48 2005-02-18, Paul Maddox wrote:
>Dustin,
> > i have been very much into FM synthesis lately and i was womdering if
> > it can be done analog? what i have looked at is a design for a quad
> > triangle VCO. with lin and log inputs. and one have a though on this ?
>
>this has been discussed on here before (can't remember when), I think
>someone was going to have a go at building some. The big issue, IIRC, is the
>'reversing' of the output wave when the input CV goes negative.

I guess what makes the most difference (both soundwise and 
construction-difficulty-wise) is that the digital oscillators can stay 
perfectly in phase with each other while being wildly modulated.

It's not easy to think of a way of having VCOs behaving like that. (And 
frankly, I'm not sure that the result would be very interesting either!)


/mr