[sdiy] Additive VCO

[Paul Perry]

>Maybe start with a triangle oscillator, then rectify, and amplify to get the
>second, do again for the fourth etc. Feed the triangles into triangle to
>sine converters, and you have a number of your waves already nicely phase
>locked.
>Of course for third, fifth etc, you'd need to get creative.

well..... I can't see the point of building anything from phaselocked triangles 
(or sines, or anything else).
>From an audio angle, there isn't really any richness at all.
If you had say 5 seperate oscillators that tracked "approximately", and each of 
which could be offset by an ajustable amount, then I think you would have all
you need.
The 'goodness' of a sound depends pretty much on the number of uncorrelated 
tones. Don't be sucked in by those static screen shots & fourier analysis, if
you look at actual notes on a cro in real time you will see the phase of the
various
harmonics moving rapidly all over the place.

paul perry Melbourne Australia