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Rossum's Linnaeus, announced just in time for Superbooth 2019, is an analog state-variable filter that offers linear thru-zero FM and true stereo operation. Covering quite different ground than the much-loved Morpheus and Evolution, Linnaeus is a worthy addition to Rossum's already remarkable selection of filters.
Linnaeus offers a remarkably broad frequency range, from subsonic to ultrasonic—and what's more, it provides accurate 1V/Oct tracking across the entire range, making melodic operation easily possible in any register. There are additional CV inputs for cutoff frequency and Q as well, each with their own attenuverters.
The Linnaeus's filter "type" is continuously variable and voltage controllable, offering multiple lowpass and highpass modes, bandpass, notch, and shelving options. These "response characteristics" are independently selectable for each channel, so a host of peculiar stereo effects can be produced, from straightforward filtering to binaural panning tricks.
Perhaps the other most remarkable feature is the integrated modulation oscillator—a dedicated modulation source for performing true linear thru-zero FM. The oscillator offers continuously variable waveshape and can either track an external CV source or can directly track the filter frequency itself, allowing for more easily tunable and conventionally "musical" FM effects. And of course, the modulation index itself is voltage controllable, providing the potential for dynamic filter FM timbres from beyond this world.
After Trident and Panharmonium, we didn't expect a new Rossum module for a bit—but now Linnaeus is here, and we're excited for all the sonic opportunities it provides.