TwinPeak Filter

Phal_anx

I created this Filter Modul after watching this Video on Youtube about the Epoch TwinPeak (Eurorack Filter Modul).

enjoy!

Jimbo

wow, that's awesome

RobertSyrett

Another good module, although I think it differs in a number of ways from the original. Still good fun though :)

biminiroad

Sick man, thanks for sharing! I think I'm going to set up a "euro clone" section of the forum with @Taylor's blessing...could be a fruitful area of discovery! :)

biminiroad

Done: http://forum.audulus.com/categories/eurorack-clones

Phal_anx

@RobertSyrett - yea its not exactly like the original.. i still try to figure out some stuff like th curve knob.. and the dual mod knob... also the twinpeak works with 2 lp filters and create a bandpass when turning the knob..

thanks, @biminiroad

biminiroad

Recategorized! :)

RobertSyrett

ha! a new category was born!

Phal_anx

@RobertSyrett, @biminiroad ... a question for both of you :)
how could i create a crossfade with 1 input and 2 outputs.. to blend seamlessly between those outputs... so it would need 1 input for the signal, 1 input for the knob and 2 outputs.. is there any exp i can use for that? i cant get my head around this

RobertSyrett

like panning?

Phal_anx

yes.. is there already a modul?

Edit: just found a pan in the moduls area :)

RobertSyrett · Screen Shot 2017-03-10 at 2.48.08 AM.png

off the top of my head...
edit: derp, the knob label is reversed, it should say b-a. hurray for waking up at 3am

RobertSyrett

The thing I don't understand about this module is one signal going to two filters and being summed again, or is one filter always a high pass and one filter a low pass and if one frequency is higher than the other they switch so that the signal never cuts out... There is a muffwiggler thread where there are pictures of a module prototype where there is a knob on the module and it is called a 3D VCF. Very interesting and very nice sounding but also kind of unclear.

Phal_anx

i can use the pan modul which is already at moduls->mixer->pan
why are you awake at 3am? :D
ok, here its 11.54 time to eat lunch...

Phal_anx

yes this is what i try to find out.. there are 2 lp filters in parallel summed at the output but if u turn the curve knob the 2nd filter switches from lp to hp.. 1st and 2nd filter are now in serial to create the bp filter... but the 1st one is still on the summed output.. something like that.. as far as i understand it

Phal_anx

i m def getting closer to the orginial already.. dual mode knob works now aswell

RobertSyrett

I'm in California. Home of almond trees and avocado sushi :)

Phal_anx

ahh california :) i live in austria... in the middle of europe :D

i just read about another twinpeak filter from KlanbauKöln

http://www.klangbauköln.de/synthesizer/3d-vcf-oszillator-klangbau-koeln-synth-module-twin-peak-filter-nach-rob-hordijk-fuer-3he/

there its written that 2lp filters are connected inverse-parallel.. i will try to invert the 2nd filter and look if this works...

RobertSyrett

ohhhhh, the second lo-pass receives a phase inverted signal, so it's basically receiving "-x." So when the two low-pass filter signals are summed, you get a band pass. I get it now.

RobertSyrett · Screen Shot 2017-03-10 at 3.58.46 AM.png

Here is my riff on the Twin Peaks filter, based on your description.

Phal_anx

also very interesting

Phal_anx

i think i got it now... its pretty close to what u can do with my clone and the one from epoch modular...

Phal_anx

thanks again, @RobertSyrett ... your patch of this filtertype helped me alot. i still will tweak it cause the freq canceling is to much..

RobertSyrett

My pleasure, It's nice to see a new filter arrangement! Now I gotta figure out how to do this with my modular analog filters...

RobertSyrett · Screen Shot 2017-05-15 at 4.31.06 PM.png

It might be time to revisit the Twin Peak filter with these new Sansnom filter modules.

Phal_anx

@RobertSyrett - I already did :) just didnt upload it here till now..

the original TwinPeak modul doesnt self-oscillate as far as i know but this one here does.. thanks to 2 of Sansnom´s LP filter moduls (v1.2)
keytracking is also a neat feature but still not included in my version.

RobertSyrett

Very nice! The filter folder is getting a little fatter every day.

Rudiger

Looking through, organizing, and reviewing the many Audulus patches that I’ve accumulated and worked on over the last year, I was reminded of the Hordijk TwinPeak filter. A simplifed version of it was included in the Blippoo Box that I had put together, and I remembered that I’d meant to make a standalone version of it at the time. And then realized that that had already been tackled on the forum.

Here’s a fresh take on the Epoch Modular version demonstrated in the James Cigler video at the top of this thread, building on the updated modules and approaches that have appeared over the course of the last year.

Rudiger

I’ve also put together a version following the layout and design Rob Hordijk created for his own modular system. It doesn’t have the cross-fader that is a handy feature of the Epoch Modular version, but that’s not necessarily needed in the context of Hordijk’s system since it includes the Dual Fader module. I enjoy the clarity of the pure symmetry of his version.

https://thehordijkmodular.blogspot.dk/2018/02/the-twinpeak-filter-best-filter-ever-in.html

Rudiger

See: https://vimeo.com/channels/1311476/240797280

vimeo.com/240797280

Rudiger

I’ve also put together a simplified, single input, micro version of the TwinPeak filter. The modulation input is set to only alter peak 2 by default, but this can easily be changed by opening up the hood and changing it to peak 1 or adding it to both.

The Hordijk Modular Blog suggests using multiple TwinPeak filters in order to achieve a complex filter with multiple resonant peaks, so I’ve tried that out in a little demo with the filters being triggered at sub-audio rates.

stschoen

Sounds great!

Paulinko

@Rudiger all of the patches and demos for them have been great for generating drones.

Rudiger

@Paulinko Yes, the the Twinpeak is very suited to creating drones, especially if you want a little movement within them. Pleased to hear you've been getting something out of them.

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