[sdiy] 2 unrelated questions.

[harry]

Someone (you need to search, sorry) had a Chua's oscillator .wav (or mp3 beats
me) on the web. You should listen before you build one.

The fractal thing is cool, but I think its better as a sequence generating
method.

look for Fractint (a program that has an option of outputting tones (up to 9
note poly)
based on the fractal generating results.) Think you can get a midi file with
some effort.
It can drive a sound card, or the internal speaker. There are quantizable scales
and
sound card options. Mine has a nasty VCA problem, but if you use midi it should
be fine !!!

See also Fred Nachbauer album Fractalus. He hangs out in the levnet group
(theremin) as well as alt.somthing??.theremin on usenet. He's got a composition
that
uses this technique and its very good.

IMHO Chua's is a curiosity, not too musically useful... or at least by my
definition
or by what I consider music....

H^) harry

Seb Carr wrote:

>     Thanks to everyone who answered my first question regarding polysynths.
> Another idea i had was if you could set up a system as follows:
> midi-cv converter controlling say, 4 vco's for 4 note poly, but only 1 vcf
> and vca. Now as people said this was not ideal as playing any new notes
> would retrigger the whole set, what if it were set up so once the gate had
> been triggered it could not be retriggered until all keys had been released
> (so adding notes does just that, adds notes with no retriggering). could
> this be done with say an xor gate on the trigger or would this not work?
>
>     Secondly, please forgive a not strictly analogue question: Chaos
> oscillators.  I am interested in building a vco that outputs a fractal or
> chaotic waveform (fractal pictures are just so cool looking, i wanted to see
> what kind of sounds i could get from chaos).  I found a diagram for an
> oscillator called a chau oscillator which ouputs a sometimes fractal
> sometimes chaotic waveform ( diagram at
> http://www.ccsr.uiuc.edu/People/gmk/Projects/ChuaSoundMusic/ ) but this
> diagram is very incomplete and my electronics skills are not up to this much
> deveopment (but this is one approach). The other i can think of would be
> more flexible but digital: a digital chip that can output a waveform
> dependant on the input algorithm (e.g. y= sin x just to get it to output
> sine wave,) or a non linear equation  (y =x(1-x) for more fractal sounds).
> This way the algorithm could be changed for different sounds, and the input
> values could be varied also for different sounds.  Now this to me sounds
> quite complex, but with the right chip, surely it shouldn't be too complex.
> my question being: any ideas on how to implement this, and what chip to use.
> Could something like a PIC chip (as i understand often used for interfacing
> purposes) be adapted for this role, and if so, how complex are they to
> program?
>
> Once agin thanx for any help and sorry for the digital question.
>
> seb carr