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Section 6 — Effect Parameters ASR-10 Musician’s Manual

44 Edit/Effect Parameters

ROM-47 DUCKER

The DUCKER algorithm 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 sent to BUS1 or BUS2 hard left, and the voice-over is sent to BUS1 or BUS2 hard right. In

this set up, BUS1 or BUS2 (hard right) is considered the side chain to a traditional compressor.

This algorithm employs an internal mixer that 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, to achieve an

externally controllable staccato effect.

DUCKER Signal Routing

BUS1 Left

BUS2 Left

BUS1 Right

BUS2 Right

Main

Output

(mono)

Compressor

(synthesis)

(Side

Chain In)

Output

Gain

(analysis)

EQ Trim

Ducker

Output

Mixer

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 +0 dB.

OUTPUT MIX Range: 0 to 99

This parameter mixes the output of the music signal (BUS1 or BUS2 hard left) with the output of

the ducker (voice-over) signal (BUS1 or BUS2 hard right) to a mono output. This is the Ducker

Output Mixer that is shown in the diagram.

COMP RATIO Range: 1/1 to 40/1, INF

This parameter sets the amount of compression. The range is based on decibels (dB) above the

threshold. 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.

THRESHOLD Range: -96 to +0 dB

This parameter sets the threshold level. Signals that exceed this level will be compressed, while

signals that are below will be unaffected.

ATTACK TIME Range: 50µs to 100ms

This parameter determines the attack rate after the initial signal has been detected and before the

compression takes affect.

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