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Rossum Linnaeus Thru-Zero State-Variable Filter
MUFF WIGGLER Forum Index -> Eurorack Modules Goto page 1, 2  Next [all]
Author Rossum Linnaeus Thru-Zero State-Variable Filter
mdoudoroff


Following in the tradition of Evolution and Morpheus, LINNAEUS represents yet another Dave Rossum innovation in filter technology.

LINNAEUS is a stereo state-variable filter that provides the unique ability to linearly modulate its resonant frequency through zero into negative frequency, while maintaining stability. With extensive voltage control of nearly every parameter, Linnaeus lets you manipulate the filter’s natural response curve in new ways, to create both subtle and dramatic timbral effects. And with a “one-knob-per-parameter” interface, LINNAEUS inspires sonic creativity that invites (and rewards) real-time interaction.

LINNAEUS’s cutoff/resonant frequency is exponentially voltage controllable from sub-audio to ultrasonic frequencies, while its resonant gain (Q) is exponentially voltage controllable from 0dB to greater than 60dB.

LINNAEUS’s channel output response characteristics are independently and continuously variable from Lowpass, through Bandpass, Highpass and Notch, to Low and High Shelving characteristics. Voltage control of the response characteristics are independently selectable for each of the two channels.

The linear thru-zero modulation is provided by an integrated modulation oscillator and/or an External Linear FM modulation input.

The voltage-controllable modulation oscillator can track the filter’s exponential frequency or operate independently. The modulation oscillator’s output waveform is continuously variable from Off through Sine, Triangle, and Sawtooth, to Square. The modulation oscillator output is summed with the external linear FM input and applied to the modulation index VCA, which controls the linear thru-zero modulation index from zero to 8X. The modulation index is, of course, also voltage controllable.

LINNAEUS features include:

– Ultra-wide frequency range, exponentially voltage-controllable from sub-audio to ultrasonic via precise 1V/OCT and attenuverted CV inputs.

– Thru-zero linear frequency modulation via an internal modulation oscillator and/or an external linear FM input.

– Variable linear modulation index, voltage-controllable via an attenuverted CV input.

– Resonance (Q) exponentially voltage-controllable from 0dB to greater than 60dB via 6dB/V and attenuverted CV inputs.

– Continuously variable response characteristics independently selectable for each of the two channels via individual Enable controls. Characteristics include Lowpass (12db/oct and 6db/oct), Bandpass, Highpass (12db/oct and 6db/oct), Notch, and Low and High Shelving.

– Voltage control of response characteristics via an attenuverted CV input. Individual Enable controls let you independently enable or disable CV control of response for each channel.

– An integrated modulation oscillator with continuously variable waveform from Off through Sine, Triangle, Sawtooth and Square. Its frequency can be exponentially voltage controlled via an attenuverted CV input.

– A Track control that lets the modulation oscillator precisely track the filter’s exponential frequency.

– Stereo inputs and outputs. LINNAEUS can process a stereo signal or two independent mono signals. While the two channels share the filter’s cutoff/resonant frequency, the filter response characteristics can be independently controlled for each channel.

– The solid, high-quality construction you expect from Rossum Electro-Music.

LINNAEUS is 16HP wide and 25mm deep.

Power requirements (max): 140mA +12V, 25mA -12V. Reverse polarity protected.

LINNAEUS will be available this summer from Rossum Electro-Music dealers worldwide.

http://www.rossum-electro.com/products/linnaeus/

~$399
TemplarK
Wow. Damn this is a crazy module!
Joe.
Quote:
Voltage control of the response characteristics are independently selectable for each of the two channels.


I don't understand how this part works. there's one CV input, but you can control both (L&R) filter's response independently?
TemplarK
Joe. wrote:
Quote:
Voltage control of the response characteristics are independently selectable for each of the two channels.


I don't understand how this part works. there's one CV input, but you can control both (L&R) filter's response independently?


I think it just means you can turn off whether its being effected by the CV for each channel. Thats what I'm reading from it at least.

edit - Oh and it seems like you can set whether its high or lowpass etc for each channel also. Pretty neat!
johny_gtr
A year of stereo filters Miley Cyrus
Unfortunately can’t find any demos of it, maybe after SB
Joe.
Definitely looking forward to hearing some demos thumbs up
Futuresound
Can't wait to hear this. It seems like Rossum is on a roll. And maybe trying a new design approach? Panharmonium, Trident and now this all seem a bit different than say Control Forge or Assimil8or.
Virusinstaller
It's like the year of crazily amazing stereo filters.
It just doesn't stop.
My heart and wallet are hurting.
Super innovative. Can't wait to hear some demos.
Jumbuktu
It also seems to be the year of 'through-zero'. I'm waiting for someone to release the first through-zero multiple.
mafouka
So awesome w00t
2disbetter
I for one, look forward to the day, when I can build an entire instrument around Rossum modules.

This looks ace, and I too am looking forward to demos!
synonymist
Jumbuktu wrote:
It also seems to be the year of 'through-zero'. I'm waiting for someone to release the first through-zero multiple.


Quotable!
jmax313
wowow!! hyper
kingcons
Demo on analoguezone's instagram: https://www.instagram.com/p/BxP1-SKIt2n/
Shakespeare
Wow... that thing sounds and looks very interesting.
MindMachine
The very first bits sound very LPG. Great tone. Lots of modulation to be patched. Very interesting for sure.

Love Rossum and his enthusiasm. That guy has reinvented himself so many times. What an amazing line of modules with his latest venture.

He is one of the unsung pioneers of the field. Oberheim and Sequential Circuits are generous in their debt of gratitude to him and Scott Wedge, but us mere mortal users may not be so aware of his and Mr. Wedge's significance to modern electronic instrument design.
Marco Alpert
With the release of Linnaeus just weeks away, we’ve posted the Quick Start Guide to the web site. Also, here’s the final production panel. What’s with the egg? Well, late in the beta testing process, our good friend and tester, Chris Meyer, raised the possibility of alternative behavior that would let Linnaeus function as a self-contained (i.e., no input required) stereo oscillator and/or FM percussion voice with some really powerful timbral capabilities.

While we were initially hesitant to try to shoehorn the new functions into the existing interface, once Dave had prototyped them, it was clear to us all that they were just too cool not to include. So we’ve provided them in the form of alternate "Ping Mode" firmware accessed by pressing and holding the Egg button.

brandonlogic
Is this module fully digital or is it a fully analog audio path with some digital control?
Marco Alpert
brandonlogic wrote:
Is this module fully digital or is it a fully analog audio path with some digital control?

It's fully digital.
synonymist
Marco Alpert wrote:
accessed by pressing and holding the Egg button

Hello Marco. Mostly I wanted to say how cool it is that your company makes a synth module that features an "Egg button". Surely yours is the only one. smile

But also I applaud Rossum Electro-Music for having the imagination and guts to expand the feature set of a stable product just before its release, when you knew it was the right thing for the product.
Bots
Hi, i'm really interested in this filter but are there allready people owning the Linnaeus?
matttech
there definitely are, because I sold them to them! hyper
Switchzik
Any chance to have a demo ? Looks amazing but we didn't hear much of it which is a pity.
Bots
Yes a demo would be great thumbs up
B0bcat
they must be out in the wild now - also keen to hear a demo!
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