Drawmer Advanced Dynamics for Mackie D8B - Manual (Page 15)

15
User’s Guide
Gate/Duck Indicators
These three LEDs indicate the action of the Gate and Duck
processors. When Gate is selected, the green LED is lit when the
Gate is open. When the signal falls 3 dB below the Threshold,
the green LED turns off and the yellow LED turns on. When the
signal level falls 40 dB below the Threshold, the yellow LED
turns off and the red LED turns on, indicating the signal is fully
gated.
When Duck is selected, the red and green LEDs work in reverse.
When the signal is above the Threshold, the red LED is on.
When the signal falls 3 dB below the Threshold, the red LED
turns off and the yellow LED turns on. When the signal level
falls 40 dB below the Threshold, the green LED turns on,
indicating the signal is unaffected by the Ducker.
Threshold
This sets the level below
which gating starts to take
place and may be set in the
range –63.5 dB to 0 dB. For
normal noise removal
applications, it is normal to
set the Threshold as low as
possible without spurious
triggering occurring, so that none of the desired signal is lost.
Attack
This control determines how quickly the gate opens, and is
variable from 20
µs to 1.1 seconds. The fastest Attack time
ensures that the gate does not clip the leading edge of extremely
fast transients. Tip: Sometimes when gating loud low-frequency
signals, a small pop is heard when the gate opens. This can be
remedied by setting the Attack to 0.5 or 0.6 ms.
Hold
This determines the amount of time the gate is held open after
the signal falls below the Threshold. It is variable from 5.0 ms to
4.74 seconds. This helps to prevent spurious re-triggering when
using fast attack times, but is also instrumental in creating the
classic gated reverb sound often applied to drums.