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Table Of Contents
80 Chapter 6 Filter
The EVOC 20 TO can be used in the insert slots of Audio, Audio Input, Bus, Master, and
Audio Instrument channels.
The signal path of the EVOC 20 TO is shown in the block diagram on page 190.
Parameters of the EVOC 20 TO
The EVOC 20 TO interface is divided into five main sections. From left to right, these are
the Analysis/Synthesis, Formant/Filter, Modulation, Unvoiced/Voiced (U/V) Detection and
Output areas.
Analysis In Parameters
Attack
The Attack parameter determines how quickly each envelope follower coupled to each
Analysis filter band reacts to rising signals. Longer Attack times result in a slower
tracking response to transients of the Analysis input signal.
Note: A long Attack time on percussive input signals (a spoken word or hi-hat part, for
example) will translate into a less articulated vocoder effect. Set Attack as low as
possible to achieve precise articulation.
Release
The Release parameter determines how quickly each envelope follower coupled to each
Analysis filter band reacts to falling signals. Longer Release times make transients of the
Analysis input signal sound for a longer period of time at the Vocoder’s output.
Note: A long Release time on percussive input signals (a spoken word or hi-hat part, for
example) will translate into a less articulated vocoder effect. Release times that are too
short result in rough, grainy vocoder sounds. Release values of around 8 to 10 ms have
proven to be useful starting points.