Rossum Linnaeus Thru-Zero State-Variable Filter

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Re: Rossum Linnaeus Thru-Zero State-Variable Filter

Post by OHEXOH » Sat Jan 16, 2021 5:22 pm

Yeah, you can go from super smooth and silky to very distorted in an FM / AM type of way. There is also the Ping mode which is also very good and runs in essentially 2 ways: you can ping the filter with an internal audio rate oscillator which essentially turns the Linnaeus into an oscillator, or you can ping the filter manually and sculpt hits which have a very FM like tone to them. I'll try and record some.

I didn't really heavily use the stereo aspects of the filter in the demos above either. Each channel can have it's own filter response settings (ie: Left channel is a LP filter and right channel is a notch filter) and both channels share the cutoff, resonance and mod index values. You can then shift the response which in dramatically affects the stereo field. I think most stereo filters offer this though.
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Re: Rossum Linnaeus Thru-Zero State-Variable Filter

Post by OHEXOH » Sat Jan 16, 2021 7:45 pm

Here's a demo of the Ping Mode - so using the filter as a self contained sound source. In this demo I'm pinging the filter manually (rather than have Linnaeus ping it with it's own oscillator). A simple v/oct pattern is going into the filter and the Osc Freq is set to track the filter. I then slowly raise the Osc Freq on the Linnaeus so you can hear all the tones that this modulation creates, there are complimentary sweet spots and more dissonant extra sweet spots :oops:

Once the Osc Freq is at the top (about 2/3rd in) I then switch off tracking and lower the frequency back down so you can hear the difference. Rounding out the demo I have the Mod Index being opened up with an envelope every 8 steps and there's a slow LFO opening and closing the Filter Q which extends/closes the decay of each filter ping. I also sweep the internal oscillator from sine through to square and back again - this dramatically affects the tones you get. Finally there's a small amount of reverb and delay - but beyond that, this is just pure Linnaeus.

It is a very musical / sweet sounding filter in my opinion and has a very unique character.
Attachments
Ping Mode.wav
(32.49 MiB) Downloaded 120 times
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Re: Rossum Linnaeus Thru-Zero State-Variable Filter

Post by pete303 » Sun Jan 17, 2021 6:04 am

Absolutely, it really sounds great - thanks a lot for this demo!

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Re: Rossum Linnaeus Thru-Zero State-Variable Filter

Post by nodog » Sun Jan 17, 2021 6:32 am

Also a thank you from me.

I've been looking for a stereo-filter and while there's stiff competition I've picked this one up, partly because of these demo's.

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Re: Rossum Linnaeus Thru-Zero State-Variable Filter

Post by NaiveMelody » Thu Jan 21, 2021 2:46 am

OHEXOH wrote:
Fri Jan 15, 2021 9:22 pm
Here you go - here are some audio demos. In general I find Linnaeus can go from super smooth to super gnarly. Once you get the Mod Index on the go you can get this ring modulator / crunchy sound which works great on most things, but especially sine waves. It's a great filter let down only by the overly large Rossum knobs. If anyone knows of any small options I'd love to switch the attenuators for something narrower - otherwise it's a pecking finger fest.

Watch your levels - there's a lot of sub in the resonant low end (I did remove some as it was just too much).


Saw Sweep.wav - simple saw sweep with different levels of resonance and other settings on each pass


Saw Wave Modulation.wav - a saw wave pattern with rhythmic stepped modulation & wiggling


Sine Wave Modulation.wav - a sine wave pattern with rhythmic stepped modulation & wiggling (especially the mod index)


Drums.wav - uptempo drum loop with rhythmic stepped modulation & wiggling
Hey,

What’re you using as the stepped modulation source?

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Re: Rossum Linnaeus Thru-Zero State-Variable Filter

Post by OHEXOH » Fri Jan 22, 2021 2:56 am

NaiveMelody wrote:
Thu Jan 21, 2021 2:46 am
Hey,

What’re you using as the stepped modulation source?
U-he CVilization in Quad Mucorder mode - it’s a fantastic 4 channel sample & hold source, with the ability to lock loops and do much, much more.
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Re: Rossum Linnaeus Thru-Zero State-Variable Filter

Post by NaiveMelody » Sat Jan 23, 2021 12:48 pm

OHEXOH wrote:
Fri Jan 22, 2021 2:56 am

U-he CVilization in Quad Mucorder mode - it’s a fantastic 4 channel sample & hold source, with the ability to lock loops and do much, much more.
Ah great! I’d heard of the module but not really understood it - just read about that mode; that seems super cool. I’d really vibe from recording CV then slowing and speeding up the rate over time.

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Re: Rossum Linnaeus Thru-Zero State-Variable Filter

Post by OHEXOH » Sat Jan 23, 2021 6:24 pm

There are other modules that do a similar thing (Brain Seed from Antimatter Audio is pretty cool, and it also fires a trigger when the value changes which can be really useful). But... the CVilization is just a beast in many other ways. The demo videos are pretty in-depth and as such can be 'too-much-info' but it's a lot less confusing in practice.
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Re: Rossum Linnaeus Thru-Zero State-Variable Filter

Post by ManBearPig » Thu Feb 25, 2021 1:22 pm

I'm the owner of a Linneaus but also new to modular (I chose it for the steep learning curve). I also have an ES-9 and am constantly playing with the Linneaus with VCVrack modules.

Anyone have any suggestions or techniques for coaxing some beautiful tones from this beast? Feels like I've barely scratched the surface with this thing...

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Re: Rossum Linnaeus Thru-Zero State-Variable Filter

Post by OHEXOH » Thu Feb 25, 2021 11:57 pm

Define beautiful... :oops:
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Re: Rossum Linnaeus Thru-Zero State-Variable Filter

Post by ManBearPig » Fri Feb 26, 2021 7:11 pm

OHEXOH wrote:
Thu Feb 25, 2021 11:57 pm
Define beautiful... :oops:
Haha, fair enough. Maybe what I should've asked for is any suggestions/techniques for getting different/distinct sounds out of it. Someone posted earlier than the Linnaeus would really benefit from a deep-dive video from the likes of Loopop, DivKid etc – hopefully one will appear soon!

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Re: Rossum Linnaeus Thru-Zero State-Variable Filter

Post by OHEXOH » Fri Feb 26, 2021 7:23 pm

I would say as a filter what it offers is quite distinct. The Mod Index / Osc Frequency combo can really create some unique tones both on it's own and onto whatever is being fed through it. I haven't used it as much as 2 separate filter channels using Response CV to pull and push both channels apart - but that might be something to have a look at. What I've also come to appreciate about the Linnaeus is that there are attenuverters on most inputs. Thank you Rossum!! :hail:
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Re: Rossum Linnaeus Thru-Zero State-Variable Filter

Post by oldenjon » Sat Feb 27, 2021 1:11 pm

Thanks for the demos @OHEXOH. It sounds really good. Does it self-oscillate? And if so are the different modes out of phase? I would guess that since it's emulating an SVF that that they are.
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Re: Rossum Linnaeus Thru-Zero State-Variable Filter

Post by Smapti » Sat Feb 27, 2021 4:49 pm

It does not self-oscillate. SVFs generally don't self-oscillate. However, since the Q can go extremely high, you can get it to ring for a long time.

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Re: Rossum Linnaeus Thru-Zero State-Variable Filter

Post by oldenjon » Sat Feb 27, 2021 4:54 pm

Smapti wrote:
Sat Feb 27, 2021 4:49 pm
It does not self-oscillate. SVFs generally don't self-oscillate. However, since the Q can go extremely high, you can get it to ring for a long time.
That's kind of a bummer. SVFs can be made to self-oscillate. That makes a scanner for the different outputs useful as you can vary the phase of the resultant sine waveform. Blades does this
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Re: Rossum Linnaeus Thru-Zero State-Variable Filter

Post by OHEXOH » Sat Feb 27, 2021 6:43 pm

If you put it in the Easter egg mode it can ping itself at audio rates and become an oscillator. I’m not sure about the phase stuff though.
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Re: Rossum Linnaeus Thru-Zero State-Variable Filter

Post by oldenjon » Mon Apr 05, 2021 10:01 am

Picked up a Linnaeus a couple weeks ago. I don't know why more people aren't talking about this filter (and Rossum modules in general). It's basically a voice module with the included modulation oscillator and index VCA. Great for percussive sounds, and my favorite ping out of all the Cwejman, Serge, and Hordijk modules I've owned (TZ-FM makes the difference). The range of Q is amazing, and the CV options like 6dB/V are really useful.

My only gripe is no CV control over Mod Osc Wave, and the knob spacing is a little tight though not more so than many other popular modules. Has anyone tried re-knobbing their Rossum modules? Something with a slight taper might improve things.
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Re: Rossum Linnaeus Thru-Zero State-Variable Filter

Post by OHEXOH » Mon Apr 05, 2021 1:12 pm

I agree - it is a fantastic module and is way more than just a filter. The sound is something else too - sounds so lush and full.
oldenjon wrote:
Mon Apr 05, 2021 10:01 am
Has anyone tried re-knobbing their Rossum modules? Something with a slight taper might improve things.
This is my gripe with Rossum modules, the knobs are too big for the panels so you end up with very dense layouts. I know that's their style but it can get tough. I would personally prefer the trimmers for the bottom row of dials - this would have helped a lot, but I know a lot of people really hate those.

I've asked around on Muffs and never got an answer on alternative knobs. Also, they feel very well attached too (on every Rossum module I own) so I'm not sure I'd feel comfortable even trying to pull them off to even see...
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Re: Rossum Linnaeus Thru-Zero State-Variable Filter

Post by jwm » Mon Apr 05, 2021 1:52 pm

OHEXOH wrote:
Mon Apr 05, 2021 1:12 pm
I've asked around on Muffs and never got an answer on alternative knobs. Also, they feel very well attached too (on every Rossum module I own) so I'm not sure I'd feel comfortable even trying to pull them off to even see...
i tried swapping mine on my panharmonium for something a little less dense and yes, it stressed me out just getting one off. those things are really on there. decided not to mess with it further (sold the module a couple weeks later anyway)

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Re: Rossum Linnaeus Thru-Zero State-Variable Filter

Post by oldenjon » Tue Apr 06, 2021 12:32 pm

I don't think there's any risk of damage involved with pulling them off, as long as they aren't glued on or something. I guess it could be easy to scratch the panel if you use the wrong tool for the job though.
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Re: Rossum Linnaeus Thru-Zero State-Variable Filter

Post by oldenjon » Tue Apr 06, 2021 12:51 pm

Yeah I just pulled one off. They are D shaft. I used a flat head screwdriver to gently pry it, and then an IC puller to get it the rest of the way off. Scratched the knob a tiny bit but that's a non-issue for me as I don't plan on reusing them.

Now the question is Sifam, or Rogan?

*edit* Actually you need reverse D shaft knobs, otherwise the pointer is in the wrong direction. Might have to go with Sifam
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Re: Rossum Linnaeus Thru-Zero State-Variable Filter

Post by OHEXOH » Wed Apr 07, 2021 6:22 pm

Do you have links to Sifam knobs?
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Re: Rossum Linnaeus Thru-Zero State-Variable Filter

Post by oldenjon » Wed Apr 07, 2021 7:22 pm

https://www.thonk.co.uk/product-categor ... fam-knobs/

Small is the size you want. Also, I found a better method for prying: Bicycle tire levers
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Re: Rossum Linnaeus Thru-Zero State-Variable Filter

Post by OHEXOH » Thu Apr 08, 2021 1:10 pm

OHEXOH wrote:
Wed Apr 07, 2021 6:22 pm
Do you have links to Sifam knobs?
Thanks and nice tip re: bicycle tire levers :love:
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Re: Rossum Linnaeus Thru-Zero State-Variable Filter

Post by oldenjon » Thu Apr 08, 2021 2:51 pm

OHEXOH wrote:
Thu Apr 08, 2021 1:10 pm
Thanks and nice tip re: bicycle tire levers :love:
I just ordered enough to re-knob Trident, Panharmonium and Linnaeus. If you get skirted you don't have to worry about reverse D shaft, there is only an indicator on the caps and those can go in any direction. Slightly cheaper too.
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