Alesis Air Compressor Alesis Air Compressor User Manual

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Keying Application: Ducking
A typical use of keying is to lower background music in the presence of
narration. This is called ducking because the music "ducks" to get out
of the way of the narration. A similar application would be to lower the
level of a rhythm guitar while a vocalist is singing. To perform duck-
ing:
1. Process the signal to be "ducked" (e.g., background music) through
the 3630. For stereo signals use both channels, for mono signals just
use one channel.
2. Plug the control signal (e.g., narration) into the channel's side chain
jack, using a cord with a mono 1/4" phone plug.
3. The Threshold, Ratio, Attack, and Release controls now affect how
much ducking will occur in response to the control signal. The Gain
Reduction meter will show how much the "ducked" signal is being
attenuated by the control signal.
Note: For stereo ducking using a single control source, the control
source may be inserted into either side chain input. An unconnected
1/4" plug (stereo or mono) must be inserted into the other side chain
input in order to disconnect the program material of that channel from
the compressor/gate control circuitry.
Voice using
sidechain
jack as
trigger input
Background music
Background music (limited
and ready to be mixed
with the lead instrument)
Ducking. The signal at the sidechain's input (lead
instrument or vocal) triggers the 3630, causing the
stereo signal present at the inputs (background
music) to be limited only when the lead instrument
or vocal is present
Mono or
Stereo plug
To mixer for
monitoring
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