[sdiy] Sine VCO - tri to sine converter

[Tim Ressel]

Yo,

Richard maked an excellent point here. I keep falling
into my "HP-lab-perfect" mode and try to make
everything as sterile as possible. But this is
subtractive synthesis: harmonically-rich waveforms are
filtered to create timbres. If your ramps are as
curve-free as Catherine Zeta-Jones, and your filters
are as clean as rap lyrics, so what? 

I have learned something recently: what is important
is that our circuits are **Well Behaved**. The VCA has
no bumps or pops, the filters don't wig out past 6
volts, that kind of thing. 

Also, it's important to HAVE FUN!!!! 

So get to it.

--Tim

--- Richard Wentk <richard at skydancer.com> wrote:
> At 15:40 28/03/2003 +0100, Czech Martin wrote:
> >After some experience even 0.1% THD is audible.
> 
> But not necessarily objectionable. Musically and
> audibly there's a lot to 
> be said for imperfect waveforms! I can't think of
> many applications where 
> you absoluetly have to have a test-equipment quality
> sine for a patch to 
> work. FM comes closest because any extra harmonics
> will smear out the 
> timbre once you started piling on the Bessels, and I
> suppose the quadrature 
> osc in a frequency shifter needs high accuracy. But
> other than that, as a 
> standard patch element even as much as a couple of %
> of THD doesn't sound 
> too painful.
> 
> In fact that's part of the grungeyness of the
> analogue sound. If you make 
> some squeaky-clean digital sines in something like
> Csound, they usually 
> sound too perfect to be musically interesting and
> you get that shiny 
> fingernails-on-blackboard digital sound instead.
> 
> Richard
> 
> 


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