[PD] Guitar distortion (Chebyshev?)

Martin Peach martin.peach at sympatico.ca
Sun Sep 12 17:32:41 CEST 2010


On 2010-09-12 11:13, Mathieu Bouchard wrote:
> On Sun, 12 Sep 2010, Pierre Massat wrote:
>
>> I m not trying to model an amp here, i m only interested in modeling a
>> distortion unit.
>
> Ah, I forgot, did you try [expr~ tanh($v1)] ?
>
> At first I assumed that you wanted to go beyond that simple distorsion
> and into more interesting forms of distortion. Chebyshev's are only
> useful if you want something that can also sounds like pitch shifts by
> harmonic steps.
>
> I think that tanh is rather close to the physical behaviour of
> capacitors being strained, but surely not exactly that, and I didn't do
> the math to figure out what the real formula would be. (Did anyone try
> that ?)
>

See attached patch. I use it instead of a fuzz box now.
It's not the capacitors, it's the amplifier losing gain when it 
approaches the power supply. Vacuum tubes have a softer knee than 
transistors.


Martin
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