Fwd: [sdiy] Modulation question

[mike ruberto]

---------- Forwarded message ----------
From: mike ruberto <somnium7 at gmail.com>
Date: Nov 9, 2007 2:48 PM
Subject: Re: [sdiy] Modulation question
To: Dave Kendall <davekendall at ntlworld.com>


Another neat thing to try is having voltage controlled modulation
sources patched to modulate each other. In my first modular I built a
unit with two A/R Envelopes a S&H and a noise source. Each function
had a VCA on it's output and I arranged a complex routing matrix for
the triggers using 3 rotary switches. The A/R generators could be
switched as LFOs and generated triggers. The S&H had slew and a
trigger output with a control to set it's threshold.

I used to spend hours with that thing and got some interesting
chaotic-like results when I patched it up in a feedback loop through
each of the functions.

M. A. Ruberto


On Nov 9, 2007 2:24 PM, Dave Kendall <davekendall at ntlworld.com> wrote:
> Hi.
>
> You might find the Functions (FUNs) in the Kurzweil K2xxx series
> interesting as a source of ideas. From the manual ;
>
>
>
> "These generate their control source signals by combining the control
> signal values
>   of two programmable inputs, and performing a mathematical function on
> the re-
> sult. Their control signals can be unipolar or bipolar, depending on
> the control
>   sources assigned as their inputs."
>
> The list of control sources has some unusual options in there. Some
> very interesting stuff can happen, particularly when one of the FUNs is
> used as an input to another.
> I've been programming a K2000 for many years, and have barely scratched
> the surface of the modulation possibilities.....
>
> Manual here;
> http://totem.menneske.dk/batch_totem/ARCHIVE/MANUALS/K2000%20Manual/
>
> cheers,
> Dave
>
> On Nov 9, 2007, at 15:09, Tom Wiltshire wrote:
>
> > Hi All,
> >
> > I've been thinking about modulation sources on synths. Basically you
> > get envelope generators of some sort, and LFOs.
> >
> > One of these generates aperiodic changes, and the other produces
> > periodic changes. I had thought that that pretty much covers it, since
> > every kind of change is either periodic or aperiodic.
> >
> > However, there is something else which I'd been missing which is that
> > some changes are predictable and some are not. Envelope generators are
> > a source of predicable aperiodic changes, and LFOs are obviously
> > predictable, since they're periodic.
> >
> > Consequently, I'm currently working on an unpredictable aperiodic
> > modulation source, done digitally. The basis is a 64-bit LFSR noise
> > source. The source (I'm calling it a random modulation generator, RMG)
> > can either interpolate linearly between noise values to produce random
> > slopes, or interpolate quadratically to produce random curves. I've
> > been having an absolute bitch getting sufficient accuracy out of
> > 16-bits to allow really slow modulation waves.
> >
> > That's the background, but what I'd like to know is whether there are
> > other important types of modulation that I'm still missing.
> >
> > What's your favourite modulation?!
> >
> >
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> >
>
>
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