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The Chorus effect simulates several voices or instruments
played at once by adding multiple short delays with a small amount
of feedback. The result is lush, rich sound. You can use the Chorus
effect to enhance a vocal track or add stereo spaciousness to mono
audio. You can also use it to create unique special effects.
Premiere Pro uses a direct-simulation method of achieving a chorus
effect, making each voice (or layer) sound distinct from the original
by slightly varying timing, intonation, and vibrato. The Feedback
setting adds extra detail to the result.
 To achieve the best results with mono files,
convert them to stereo before applying the Chorus effect. - Bypass
- Keyframeable option that specifies whether to apply or bypass
the Chorus effect.
- Custom Setup
- Opens a mixer-style control panel that controls the properties with
knobs.
- Individual Parameters
- Opens a set of parameter controls for the Chorus effect.
- LfoType
- Specifies wave type of Low Frequency Oscillator: Sin(e),
Rect(angle), or Tri(angle).
- Rate
- Determines the maximum rate at which amplitude changes occur.
With very low values, the resulting voice slowly gets louder and
quieter, like a singer that cannot keep his or her breath steady.
With very high settings, the result can be jittery and unnatural.
Very high settings can produce interesting special
effects (as in the Another Dimension preset). - Depth
- Determines the maximum variation in amplitude that occurs.
For example, you can alter the amplitude of a chorused voice so
that it is 5 dB louder or quieter than the original. At extremely
low settings (less than 1 dB), the depth may be unnoticeable unless
the Modulation Rate is set extremely high. At extremely high settings,
however, the sound may cut in and out, creating an objectionable
warble. Natural vibratos occur around 2 dB to 5 dB. Note that this setting
is a maximum only; the vibrato volume might not always go as low
as the setting indicates. This limitation is intentional, as it
creates a more natural sound.
- Mix
- Determines the ratio of Dry and Effects signal. A setting
of 100% corresponds to a ratio of 1/1 while a setting of 0 will
defeat the effect signal.
- Feedback
- Adds a percentage of processed voices back into the effect
input. Feedback can give a waveform an extra echo or reverb effect.
A little feedback (less than 10%) can provide extra richness, depending
on the delay and vibrato settings. Higher settings produce more
traditional feedback, a loud ringing that can get loud enough to
clip the signal. Sometimes this clipping is a desired effect, as
in the Flying Saucers preset, which generates the warbled sounds
of UFOs whizzing around your head.
- Delay
- Specifies the maximum amount of delay allowed. An important component
of chorusing is the introduction of short delays (often in the 15-35 millisecond
range) that vary in duration over time. If the setting is very small,
all the voices start merging into the original, and an unnatural
flanging effect might occur. If the setting is too high, a warbled
effect might occur, like a tape being eaten by a cassette deck.
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