PreenFM > preenfm2 and preenfm3

New filters

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Toltekradiation:
hi,
I finally dared to dig the preenfm code, and, it was worth it  8)
here is a firmware attached, that include some more filters :
- lp2 : lp with double filtering
- same for hp2 and bp2
- tilt : adaptation of this : https://www.musicdsp.org/en/latest/Filters/267-simple-tilt-equalizer.html
- allpass : simple allpass filter, need some more work, not sure what to do with this one...
- saturation : this : https://www.musicdsp.org/en/latest/Effects/42-soft-saturation.html
- sigmoid : a classic tanh distortion : https://www.musicdsp.org/en/latest/Other/178-reasonably-accurate-fastish-tanh-approximation.html

I hope you like it!

your ideas and bug report are welcome.

If you want to see the code, here it is : https://github.com/pvig/preenfm2

(edit 2019-09-11 12:45:37 PM : updated attachement)

kyoto:
wow - great - now will try ;)

matrix12x:
Awesome!!! I've been wanting to do an all-pass for a while. I also wanted to do a comb-filter with some distortion. I will try this out and let you know if I find any bugs.

Great work!

Toltekradiation:
hi guys, thanks for the interest !
yes there is some room for experimentation !
but not so much cpu, so it seems we must keep it simple..
still finding my way through this, but yeah! i added foldback & xor distortion to this version.. + some tweaks and fine tuning around the sigmoid & distortion..

(edit : modified version with new foldback algo)

Toltekradiation:
another version with some bug fixes :
all new filters can now be controlled with the matrix.
+ various tweak
i think i'm done for today  :P

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