[sdiy] Sine-wave VCOs?

[Metrophage]

True that for real FFT style synthesis you'd need many. I have a K5M
which I use for such antics. Too bad its at my parents house now. I
can't wait to find a K150fs!

I think you can have much fun with even only a few sines.The DX-7 et al
are examples of this. Those are digital, but only six operators. Six
analog sine VCOs is not too much of a project. Even the electribes I'd
heard often reminded me of a simple two operator FM. Not unlike the
"second-skin" feature in some of the Simmons drum units.

Since I never heard of a six sine VCO rack, I assumed there was a
particular trick to building such a thing. Maybe it's hard to get the
VCOs to track well? At least for a drum synth that'd be less of an
issue. I've seen some VCOz for FM in Electronotes which looked kind of
freaky. Switches for going "through zero", though I am not sure what
that means. Again, I assumed that since we were dealing with bipolar
analog circuits that you'd be able to do that anyway. I guess not!

I need to get the repairs and mods off of my bench so I can try some
new stuff

--- Tim Ressel <madhun2001 at yahoo.com> wrote:
> Yo CJ,
> 
> Yep, it is indeed possible to make a sine VCO. For
> example you can make a sine oscillator with two
> integrators with feedback, which is the basic topology
> for a state-variable filter. Digital generation is
> also a possibility.
> 
> I suspect folks have not gone that way in the past
> because sines have almost no harmonics and
> uninteresting in subtractive synthesis. And for
> additive you need a whomp of a lot of oscillators, not
> to mention a big controller thingie. DSP is the way to
> go for additive synthesis I suspect.
> 
> --tr
> 
> 
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