[sdiy] harmonics & vibrato

[Richard Wentk]

At 02:54 19/12/2002 +0100, you wrote:

> > Actually I *transformed* a patch on my Virus just by adding a touch of
> > random pitch offset to each voice oscillator. Suddenly it came alive. So
>it
> > definitely does have its uses.
>
>That's why I said randomizing is a good start.
>
>But there is more. On my OB-8 some of the voices are more detuned
>that others (faster beating between VCOs), and due to the voice allocation
>the same amount of detuning will come every 8th key.

Fair enough. I tend to ignore things like that because I don't have any 
ancient analogue polysynths, and things like Reaktor, Csound and the Virus 
don't work the same way.

>"Distorting the waveshape" is just a different way to look at it.
>I would like to describe it as AM (amplitude modulation of the LFO
>wave by aftertouch) plus manual modulation of the VCO frequency by
>a HP-filtered force of the fingers (from the DC offset part of the LFO).

Hmmm. What would be interesting is setting up a combined modulation patch 
where a little aftertouch faded in the vibrato, and then after a certain 
point more aftertouch edged up the frequency of the modulation but didn't 
increase the amplitude any further.

Of course you can't do that kind of breakpoint scaling on most hardware. :(

Richard