[sdiy] quadrature VCO - a different approach

[JH.]

> Are you doing anything special for your new studio space? Like, no walls
at
> right angles, etc.?

The studio actually has a non-rectangular shape! I never thought about this
under acoustic aspects, though, because I'm doing overeything over
headphones with room simulation from the quantec.


> I'm wondering why you wouldn't use a QuadDCO. Encore Electronics used this
> approach for its frequency shifter, and it seems logical to a
> computer-friendly guy like myself. We don't always like audio DCOs because
> they are so sterile and stable, but those attributes seem like benefits in
> this case.

The reason is quite simple: I can't build DCOs. Analogue is much more
convenient
for me. But there is more: I can also generate something I'd like to call
"non-periodic quadrature signals" with that filter. Remember that _any_
input
(like the manual movement of a slider - fed with DC) will create two
CVs which are 90 degrees apart in phase for each of the movemen't harmonic
components, as long as these harmonics are located within 15mHz (milli-Hertz
!)
and 30kHz. That's about _every_ manual modulation that you can possibly
perform in a sensible musical context!

It's not finished yet - only the lower half (lower frequencies) so far, but
it's remarkable what CVs you can create by simply moving a slider (one
VC "chasing" the other with approx. 90 deg distance, _regardless_ of
the speed whith which the slider is moved).


> P.S. I was listening to your CDs during the week, and Holiday in Purgatory
> is displacing Dark November as my favorite of the 3. Really nice work.

Thanks for your nice words!
I am starting to copy the CDs on my new computer now, btw. Much easier
than with the standalone recorder. I plan to record a 4th CD soon,
but with the house and all it's unlikely that I can sell it before next
year.

JH.