8

Chapter 4 Dynamics 43
Ducker
Ducking is a common technique used in radio and television broadcasting: when the
DJ/announcer speaks while music is playing, the music level is automatically reduced.
When the announcement has finished, the music is automatically raised to its original
volume level.
The Ducker plug-in provides a simple means of performing this process. It can even
reduce the music level before the speaker starts (but this introduces a small amount of
latency).
Ducker Parameters
 Intensity: Defines the amount of volume reduction (of the music mix track—this, in
effect, is the output signal).
 Threshold: Determines the lowest level that a side chain signal must attain before it
begins to reduce the (music mix) output level by the amount set with the Intensity
slider. If the side chain signal level doesn’t reach the threshold, the (music mix) track
volume is not affected.
 Attack: Controls how quickly the volume is reduced. If you want the (music mix)
signal to be gently faded out, set this slider to a high value. This value also controls
whether or not the volume is reduced before the threshold is reached—the earlier
this occurs, the more latency is introduced. It should be noted that this only works if
the ducking signal is not live (in other words, the ducking signal must be an existing
recording): Logic Express needs to analyze the signal level before it is played back, to
anticipate the point where ducking begins.
 Hold: Determines the duration that the (music mix) track volume is reduced for. This
control avoids a chattering effect that can be caused by a rapidly changing sidechain
level. If the sidechain level hovers around the threshold value, rather than clearly
exceeding or falling short of it, set the Hold parameter to a high value to compensate
for rapid volume reductions.