Rossum Electro-Music / Locutus Silver

This is an expansion module for ASSIMIL8OR that can receive MIDI velocity, aftertouch, and CCP changes and modulate them in various ways, or conversely, output 24 CV inputs as CC.

Linnaeus is Rossum's third filter module, following Evolution (a low-pass filter based on the filter in the E-mu Sytem2100) and Morpheus (a 14-pole Z-Plain digital filter in the E-mu Morpheus synthesizer). It is an innovative stereo state variable filter that is a highly evolved version of the multimode filter in the Oberheim SEM.

Linnaeus features two newly designed through-zero state variable filters that allow linear modulation of the resonance frequency from zero to negative frequencies while maintaining stable operation at all times. With extensive CV control of almost all parameters, Linnaeus allows new ways to control the natural response curve of the filters, allowing for subtle or dramatic sound effects. With a "one knob per parameter" interface, Linnaeus is well suited to real-time interaction and stimulates creativity.

The cutoff/resonance frequency of the Linnaeus can be exponentially CV controlled from insanely low frequencies below 20Hz to ultrasonic frequencies above 20,000Hz. At the same time, the resonant gain (Q) can be exponentially CV controlled from 0dB to over 60dB.

The characteristics of the two Linnaeus filters can be continuously varied independently from low pass to band pass to high pass to notch, low shelving to high shelving characteristics. CV control of the response characteristics can be selected separately for each of the two channels.

Linear through-zero modulation is driven by the built-in modulation oscillator and/or an external linear FM modulation input.

The CV-controlled modulation oscillator can track the linear frequency of the filter or run independently. The output waveform of the modulation oscillator can be continuously varied from off to sine, triangle, sawtooth and square. The output of the modulation oscillator is summed with the external linear FM input and applied to the modulation index VCA, which controls a linear through-zero modulation index from 0 to 8x. Of course the modulation index is also CV controllable.

Linnaeus features:

Very wide frequency range, from sub-audio to ultrasonic, with exponential CV control via precise 1V/OCT and attenuable CV input.
Through-zero linear frequency modulation via the internal modulation oscillator and/or external linear FM input.
Variable linear modulation index, CV controllable via attenuable CV input.
Exponential CV controllable resonance (Q) from 0dB to over 60dB, with 6dB/V and attenuable CV input.
Continuously variable response characteristics can be independently selected for each of the two channels using the Response Enable buttons. Characteristics include low pass (12db/oct and 6db/oct), band pass, high pass (12db/oct and 6db/oct), notch, low shelving and high shelving.
CV control of the response characteristics with attenuable CV inputs. Separate Response CV Enable buttons allow the response of each channel to be individually enabled or disabled by CV.
Integrated modulation oscillator with a waveform that varies continuously from off to sine, triangle, sawtooth and square. Its frequency can be exponentially CV controlled using the attenuable CV input.
Track control allowing the modulation oscillator to precisely track the filter index frequency.
Stereo input and output. Linnaeus can process a stereo signal or two independent mono signals. The two channels share the filter cutoff/resonance frequency, but the filter response characteristics can be controlled separately for each channel.
Linnaeus is built like other Rossum Electro-Music modules with thick aluminum panels, sturdy aluminum knobs, and high-quality components.
Another feature of Linnaeus: Ping Mode
The feature description above describes Linnaeus as originally conceived and designed by Dave. However, later in the beta testing process, good friend and tester Chris Meyer at Rossum Electro-Music suggested the possibility of a "Ping Mode" that would include some very powerful sound generation capabilities, where Linnaeus would function as a self-contained (no input required) stereo oscillator and FM percussion voices.

At first, we were hesitant to try to add new functionality to the existing interface, but after Dave built a prototype, we decided that this feature was so cool that we just had to include it in Linnaeus. Therefore, the Ping mode is provided as an alternative firmware that can be accessed by pressing and holding the Egg button or by double-clicking it.

Product name Linnaeus Black
Product type Eurorack modular synthesizer
List price 82,900 yen (excluding tax)
JAN code 4580646113730
Support information Linnaeus
Width 16HP
Depth 25mm
Current consumption +12V: 155mA
-12V: 36mA