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Description
At the core of the EVOLUTION Variable Character Ladder Filter is Dave Rossum’s enhancement of the iconic Moog ladder filter from the original E-mu Systems 2100 LPF module (which, incidentally, Dave counts as his favorite sounding of all of the analog filters he designed).

For EVOLUTION, Dave has designed new capabilities that not only allow you to dial in all of the outstanding qualities of the original 2100, but combine to let you create the sonic characteristics of a wide variety of other filter types.

They include:

A Genus control that allows continuous voltage control of the number of filter poles (from 3 to 6 poles), essentially allowing real-time variation of Evolution’s effective cutoff slope from 18dB/oct to 36dB/oct. LEDs give continuous indication of the current slope.
A Species control that lets you vary the signal level into the ladder, letting you control the intensity of the filter’s characteristic distortion. When in self-oscillation mode, this control modulates the amplitude of Evolution’s output.
Voltage controlled resonance with a variable Q Level Compensation control that controls the balance of the resonant peak and the frequencies below the cutoff frequency (which would otherwise be attenuated as the resonance is increased).
An extremely accurate and temperature-stable frequency control exponential generator (accurate over 10 octaves), rivaling the specifications of the best analog VCOs.evolution_pat
Taken together, EVOLUTION gives you everything from the platonic ideal of the classic ladder filter to a vast selection of alternative filter characteristics.

And like all Rossum Electro-Music modules, it’s solidly built, with machined aluminum knobs and high quality components throughout.
Rock n Roll Vintage Guitars

Rock n Roll Vintage Guitars

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Rossum
Brand New
17 Years
Rock n Roll Vintage Guitars
For Sales Heith or Andrew
773-878-8616
Chicago, IL
10:36 AM
Weekdays 11am to 7pm CST Weekends Noon to 5PM CST Closed Christmas day, New Years day and a few more holidays

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We ship to both domestic and international customers. We reserve the right to cancel and refund international orders that might be impacted by CITES export regulations. Please see our website for all current terms and conditiins.

All Guitars have a 48 hour authentication period. Buyer is responsible for shipping back returned items with no exceptions. All returned items must arrive in the same condition they were sent. Buyer must contact us within 24 hours of receiving a damaged item. Please see our website for current return policy details.