[sdiy] Modulation question

[Dave Kendall]

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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