Ducker Gate - ENSONIQ DP/4 Musician's Manual

Section 4 - Algorithms
DUCKER
I
GATE
00 - Ducker / Gate is a compressor that automatically lowers the level of a signal (such as
music) when another signal (like an announcer voice-over) comes in. When the voice-over
leaves, the level of the original signal is restored. This algorithm is useful for voice-overs, Rap,
and DJ work. In order for this algorithm to work properly, the music (audio source to be ducked)
must be plugged into Input 1 (left), and the voice-over is plugged into Input 2 (right) . . In this set
up, Input 2 is considered the side chain to a traditional compressor. This algorithm employs an
internal mixer which mixes left and right inputs to a mono output.
The gate function is achieved for high compression ratios. In this application a transient signal
source, such as a snare drum, can gate on and off some other music signal in Input I, to achieve
an externally controllable staccato effect.
Ducker
I Gate Signal Routing
124
Left
Right
01-Mix
02-Volume
Compressor
(synthesis)
EQ
(analysis)
Output
Gain
Side Trim
Ducker
Output
Mixer
Main
Output
(mono)
See the descriptions under the Mix and Volume Parameters, earlier in
this
section. The mixer
works as in all the other algorithms, and is distinct from the ducker output mixer, shown above.
03 - Output Gain
Range: -48 to +48 dB
This parameter sets the amount of cut (negative values) or boost (positive values) applied to the
ducker on the output volume. We recommend a starting application of 00 dB.
04 - Ducker Output Mix
Range: 00 to 99
Mixes the output of the music signal (Input 1) with the output of the ducker (voice-over) signal
(Input 2) to a mono output. This is the internal mixer which is shown in the diagram.
05 - Comp Ratio
Range: 1:1 to 40:1, infinity
This parameter sets the amount of compression. The range is based on decibels (dB) above the
thteshold. If this is set to 4:1 for example, it will compress changes in signals above the threshold
by one quarter. When this is set to infinity, it acts as a limiter.
06 - Threshold
Range: -96 to +00 dB
This parameter sets the threshold level. Signals that exceed this level will be compressed, while
signals that are below will be unaffected.
07 - Gain Change
Range: NlA
This read only parameter displays a gain reduction meter.
ENSONIQ DP/4 Musician's Manual
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