[sdiy] Filter slopes

[Ian Fritz]

Yes, good points.  What to do depends on what controllers you use. When I use my wind controller I can vary just about any parameter with breath pressure, so increasing filter cutoff with loudness is simple and almost always done. Not exactly the same as a fixed filter with variable slope, but can give some reasonably acoustic-like sounds.

BTW, my old hybrid synth for wind control is now ported to Reaktor and available to any interested wind-controller folks.

Ian

> On Jun 11, 2018, at 10:01 AM, Guy McCusker <guy.mccusker at gmail.com> wrote:
> 
> The mention of Luce was enough to remind me about the Electronotes
> article. It's in EN72 and refers to Luce's work directly.
> 
> Bernie suggests that what is needed to create the effects that Luce
> identifies is a filter with fixed corner frequency but variable slope
> because the spectral content changes between the louder and softer
> sounds.
> 
> There's some additional discussion in one of the articles Bernie has
> made available for free: http://electronotes.netfirms.com/EN224.pdf
> 
>> On Mon, Jun 11, 2018 at 4:32 PM, Elain Klopke <functionofform at gmail.com> wrote:
>> 
>>> I believe these plots are of the overall instrument response, not of
>>> individual notes, correct?  You didn't give us any details, but that's what
>>> they usually are.  More or less the formant response.  So probably a fixed
>>> frequency filter is what you would be wanting, not a VCF.  Could you give us
>>> more details, like perhaps the figure caption?
>>> 
>> 
>> This is correct. The article is "Dynamic Changes of  Orchestral Instruments"
>> by David A. Luce from the AES E-Library (obtained legally). It talks about
>> the timbre or tone quality of the overall instrument in a simplified manner.
>> So yes, fixed filters are preferred.
>> 
>> Rutger mentioned spectral tilting of parallel filters and that got me
>> thinking about the tone control from the Big Muff Pi. I fired up the Tone
>> Stack Calculator and played around with the values and it "seems" like I can
>> get the responses that I'm looking for.
>> 
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