Apple MainStage 3 Instruments - MainStage 3 Instruments
Apple MainStage 3 Instruments - MainStage 3 Instruments
Apple MainStage 3 Instruments - MainStage 3 Instruments
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EVOC 20 PolySynth analysis parameters<br />
The parameters in the Sidechain Analysis section control how EVOC 20 PolySynth analyzes<br />
and uses the input signal. Be precise with these parameters to attain the best possible speech<br />
intelligibility and the most accurate tracking.<br />
Sidechain analysis parameters<br />
••<br />
Attack knob: Rotate to determine how quickly each envelope follower—coupled to each<br />
analysis filter band—reacts to rising signal levels. Longer attack times result in a slower<br />
tracking response to transients—level spikes—of the analysis input signal. A long attack time<br />
on percussive input signals—a spoken word or hi-hat part, for example—will translate into<br />
a less articulated vocoder effect. Set the Attack parameter to the lowest possible value to<br />
enhance articulation.<br />
••<br />
Release knob: Rotate to determine how quickly each envelope follower—coupled to each<br />
analysis filter band—reacts to falling signal levels. Longer release times cause the analysis<br />
input signal transients to sustain for a longer period at the vocoder’s output. A long release<br />
time on percussive input signals—a spoken word or hi-hat part, for example—will translate<br />
into a less articulated vocoder effect. Use of extremely short release times results in rough,<br />
grainy vocoder sounds. Release values of around 8 to 10 milliseconds are useful starting points.<br />
••<br />
Freeze button: Turn on to hold—or freeze—the current analysis sound spectrum indefinitely.<br />
When Freeze is enabled, the analysis filter bank ignores the input source, and the Attack and<br />
Release knobs have no effect.<br />
••<br />
Bands field: Drag to set the number—up to 20—of frequency bands used by the filter banks.<br />
Freeze the input signal<br />
Freezing the input signal lets you capture a particular characteristic of the signal, which is then<br />
imposed as a complex sustained filter shape on the Synthesis section. Here are some examples<br />
of when this could be useful:<br />
••<br />
If you are using a spoken word pattern as a source, the Freeze button could capture the attack<br />
or tail phase of an individual word within the pattern—the vowel a, for example.<br />
••<br />
People cannot sustain sung notes indefinitely. To compensate for this human limitation,<br />
use the Freeze button. If the synthesis signal needs to be sustained but the analysis source<br />
signal—a vocal part—is not sustained, use the Freeze button to lock the current formant<br />
levels of a sung note, even during gaps in the vocal part, between words in a vocal phrase. The<br />
Freeze parameter can be automated, which may be useful in this situation.<br />
mm<br />
Click the Freeze button to hold, or sustain, the sound spectrum of the analysis input signal.<br />
Chapter 8 EVOC 20 PolySynth 140