User Guide

Chapter 6 Filter 109
Note: A long attack time on percussive input signals (such as spoken word or hi-hat
parts) results in a less articulated vocoder effect. Set Attack as low as possible to
achieve precise articulation.
 Release knob: Controls how quickly the 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 results in 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 are a useful starting point.
 Freeze button: When selected, the current analysis sound spectrum is held
indefinitely. This can capture a particular characteristic of the source signal, which is
then imposed as a complex sustained filter shape on the Synthesis section. While
Freeze is selected, the analysis filter bank ignores the input source, and the Attack
and Release parameters have no effect.
Using a spoken word pattern as a source, for example, the Freeze parameter can
capture the attack or tail phase of an individual word within the pattern; for example
a vowel sound.
Another use of the Freeze parameter is to compensate for people’s inability to
sustain sung notes for a long period without taking a breath. If you wish the
synthesis signal to be sustained when the analysis source signal is not, Freeze can be
used to lock the current formant levels (of a sung note), even during gaps in the
vocal part, such as between words in a vocal phrase.
 Analysis In pop-up menu: Sets the analysis signal source. The choices are:
 Track: Sets the audio track into which the EVOC 20 TrackOscillator is inserted as
the analysis signal.
 Side Chain: Sets the Side Chain (another audio track) as the analysis signal. You
choose the Side Chain source track from the Side Chain pop-up menu at the top of
the EVOC 20 TrackOscillator window.
Note: If Side Chain is selected, and no Side Chain track is assigned, the track’s signal is
used as the analysis source.
Synthesis In Section
The parameters in section control various aspects of the synthesis signal.
 Synthesis In pop-up menu: Sets the synthesis signal source. The choices are: