ok that dit it Bocanegra! I replaced also the tanh expr with an analog clipper . wonderfully harsh now 
Thank you
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[bob~]
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replacing expr with the analog cliping has reduced cpu consumption of the patch also!
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@tungee Nice one! I wonder if the anaclip algorithm is cheaper on CPU than [expr~]...
Comparison of the two functions:
They should sound the same. Except for the divide by 5 currently in the expr~
EDIT: "Anaclip" indeed shaves off a significant amount of CPU use
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Yes i have 60% CPU saving Boca! expr~ sucks also more details in the sound in my opinion!
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@tungee nice, makes the [lop~] version of my morphing filter barely even register on the cpu use. Will rework it to suit and include it in my next go around. What you hear as a difference is just that you shifted the q range which gives you more control in the area you are interested in, playing with the division in the [expr~] will yield the same results at. The /5 was picked for the morphing filter since high distortion self oscillation range emphasizes the morphing nicely, but at cost of more traditional resonance sounds, putting the sliders max range at 5 makes it easier to get the more traditional sounds.
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Build a automatonism modul out of your abstraction Bocanegra. with modulation inputs preset saving midi controlling etc.
I really like it how it sounds
Here is the automatonism module with install instructions and the modul itself:
Boca-Ladder.zipThank you for your explanations oid
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I made also a clipping module for automatonism with various clipping algorithms
There you can hear the differences from one algo to the other on the fly oid.
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@tungee why havent you posted these wonderful clipping algorithms in the sigmoid thread -> https://forum.pdpatchrepo.info/topic/13544/sigmoid-functions
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Good question Bocanegra
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@tungee Ignore my explanation, turns out mine does have anemic resonance, side effect of the 10 sample delay that worked into the feedback path somehow, I had tuned everything to compensate for that 10 sample delay. The explanation was half right, but @bocanegra explained that part already.
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Bytheway an excellent thread you made here both oid and bocanegra
Nevermind oid -
little note: your filter does not resonate at the cutoff frequency.
top: how it should be, bottom: how it is
now, solve this
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@solipp If you have a solution why don't you share it? What is going on inside the second [pd ladder] sub patch I wonder...
Experimenting a bit, it becomes obvious that resonance screws with the filter gain coefficient
Using these crazy ass formulas for filter gain and and feedback I get correct frequency response at resonance close to 1:
It looks like this when I implement it:
I know it aint pretty... It also beefs up the CPU use quite a bit, which I sort of dealt with by by keeping it in a sub patch with normal block size and no oversampling. Another downside is the soft clipping has got to go- it screws up the precision.I wonder if there is a simpler way to approximate this stuff...
Anyway, have fun finding all my design flaws
4plop~.pd -
I wonder if there is a simpler way to approximate this stuff...
Turns out there is. A bit of polynomial magic and I got rid of the [exp~] module
Also ditched the resonance/feedback formula as I didn't see it making a greater difference in frequency response than it did in CPU usage
Updated version with precise response at resonance around 4 and cut off < 11025Hz - still no soft clipping...
4plop~.pd -
Hi boca can you provide the whole patch?
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@tungee said:
Hi boca can you provide the whole patch?
I already did in my last post
@bocanegra said:
Updated version with precise response at resonance around 4 and cut off < 11025Hz - still no soft clipping...
4plop~.pd -
I dont understand, there is only one input . Shouldnt be 3 inputs there (signal input, cutofffreq and rsocnance)?
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That is the coeff sub patch you are looking at. This is what I get when I open the attached .pd file from here:
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Ah ok now its clear, there was a subpatch ok. If i use this in my automatonism module, it fires up when dragging the slider some Nasty highpeaks. So i installed the anaclip again in it.
Also: the patch of yesterday was stable until 8000hz at 5 resonance. now i can go upto 11khz and reso 10
. Thats nice! GREAT JOB BOCANEGRA :DD -
@bocanegra http://www.willpirkle.com/Downloads/AN-4VirtualAnalogFilters.2.0.pdf is a good read. I translated the TPT laddder filter to pd in the [pp.ladder~] object in audiolab (you can download it with deken). Here is a version with an outlet for each pole and the "analog clipper" from above : TPT-ladder.pd
Another solution is [bob~] of course: https://github.com/pure-data/pure-data/blob/master/extra/bob~/bob~.c
