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OPTIMOD-PC
As the AGC B C
PL
trol affects the sound less and less.
The interaction between the AGC B
trol is a bit complex, so we recommend leaving the AGC B
its factory setting unless you have a good reason for readjusting it.
AGC Idle Gain. The "idle gain" is the target gain of the AGC when the silence gate
is active. Whenever the silence gate turns on, the gain of the AGC slowly moves to-
wards the idle gain.
The idle gain is primarily determined by the AGC D
will ordinarily produce an idle gain of –10 dB (i.e., 10 dB of gain reduction). How-
ever, sometimes you may not want the idle gain to be the same as the AGC D
setting. The AGC I
gain setting determined by the AGC D
You might want to do this if you make a custom preset that otherwise causes the
gain to increase or decrease unnaturally when the AGC is gated. For example, to
make the idle gain track the setting of the AGC D
control to zero. To make the idle gain 2 dB lower than the setting of the AGC D
control, set the AGC I
AGC Bass Attack sets the attack time of the AGC bass compressor (below 200Hz).
AGC Master Attack sets the attack time of the AGC master compressor (above
200Hz).
AGC Bass Release sets the release time of the AGC bass compressor.
AGC Crossover allows you to choose A
is a phase-rotating crossover that introduces one pole of phase rotation at
A
LLPASS
200 Hz. The overall frequency response remains smooth as the two bands take dif-
ferent amounts of gain reduction—the response is a smooth shelf without extra
peaks or dips around the crossover frequency. The two bands are down 3 dB at the
crossover frequency. However, this mode adds group delay distortion and is there-
fore subtly less transparent-sounding than the L
(Linear-Phase; no delay) is a phase-linear crossover whose upper
L
N
D
INEAR
O
ELAY
band is derived by subtracting its lower band from the crossover's input. When the
upper and lower bands have the same gain, their sum is perfectly flat with no phase
rotation. However, when the upper and lower bands have different gains, peaks
and dips appear in the frequency response close to the crossover frequency. It is use-
ful if you need a crossover with low delay and no phase distortion when flat. Its
downside is the possibility of audible coloration when the gains of the two bands
are considerably unequal.
control is moved towards "100%," the AGC B
ASS
G
control allows you to add or subtract gain from the idle
DLE
AIN
RIVE
control to –2.
G
DLE
AIN
LLPASS
T
control and the AGC B C
HRESHOLD
ASS
setting—a setting of 10 dB
RIVE
setting.
control, set the AGC I
RIVE
or L
N
D
INEAR
O
ELAY
N
D
INEAR
O
ELAY
OPERATION
con-
T
ASS
HRESHOLD
con-
PL
T
control at
HRESHOLD
RIVE
G
DLE
AIN
RIVE
modes.
mode.
3-37
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