![](https://pdfstore-manualsonline.prod.a.ki/pdfasset/4/c7/4c7bc5b2-3c0f-4b32-a7a3-f96ea322ce3b/4c7bc5b2-3c0f-4b32-a7a3-f96ea322ce3b-bg2.png)
Active / Bypass switch
e Active / Bypass switch bypasses or activates dynamics
processing for each channel. Side-chain metering and Listen
continue to operate in Bypass. Bypass switches remain indepen-
dent in Link mode.
Gate / Duck / Expand mode switch
e G4 has three modes of operation: Gate, Ducker or down-
ward Expander. See the Operation section on page Manual-4
for operation details of each mode.
Threshold
In Gate mode, THRESHOLD sets the key level below which
the Gate is closed.
In Expand mode, THRESHOLD sets the key level below
which downward expansion takes place.
In Duck mode, THRESHOLD sets the key level above
which the signal is ducked.
Attack
In Gate mode, ATTACK determines how quickly the Gate
opens when the key signal goes above the set threshold.
In Expand mode, ATTACK determines the rate of gain in-
crease as the key signal moves toward or above the set threshold.
In Duck mode, ATTACK determines how quickly the
signal is ducked as the key signal goes above threshold.
Front Panel Controls
Meters
e eleven-segment SIDE-CHAIN signal meter indicates
level relative to the reshold (dBr), allowing easy and intuitive
adjustment of the Gate threshold. e reshold indicator TH
is lit whenever the ltered side-chain signal is at or above the
set threshold. e signal peak value is held briey to assist in
setting a proper threshold.
Meter ballistics follow the response of the side-chain detec-
tor. Gate and Duck modes use peak detection with instanta-
neous attack and 25 ms decay. Expand mode uses rms detection
with an averaging time constant of 50 ms.
Gate status is shown using a seven-segment gain reduction/
gate meter. is meter is eectively an expanded version of the
simple “stop light” meter found on many gates. e inclusion
of gain reduction metering allows the user to view the transi-
tion progress of the Gate and Ducker as well as the current gain
reduction when in Expand mode. e CLOSED LED is not ac-
tive in Expand mode. e response of the gain reduction meter
accurately follows the Attack/Hold/Release envelope.
With this combined metering system it is possible to see at a
glance where the signal level is in relation to the threshold, and
the amount of gain reduction being applied.
Stereo Link
Channels 1 and 2 may be Linked for stereo operation, as may
channels 3 and 4. Channels 1 and 3 act as the Master when
Linked, with channels 2 and 4 operating as Slaves to their
respective Masters. When Linked, only the Master’s rotary
controls and mode select switch are active. e Master controls
the gain reduction of both channels.
Gate and Duck modes use look-ahead peak detection and
the Master uses the larger of the two processed signals. In
downward Expand mode, rms detection is used and the master
uses the rms sum of the ltered side-chain signals.
Side-chain bypass, Internal/External and Listen switches
remain independent when channels are Linked. To trigger from
only one key input, set the key source (INT/EXT) of the signal
you wish to ignore to EXTernal and leave the rear panel side-
chain input disconnected.
Manual-2
612-12-6-3-131-24 TH
CLOSED OPEN
SIDE-CHAIN dBr
OL
MASTER SLAVE
12
LINK
MASTER SLAVE
34
LINK
BYPASSACTIVE
DUCK EXPGATE
dBu
-60
-20
-10-30
-40
-5010
20
0
THRESHOLD
ms
250
50
25 100
0
ATTACK