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OPTIMOD-PC
may eventually be increased unnaturally. Accordingly, when you operate the 2B R
control between 8 and 2 dB/second, it may be wise to defeat the gain-riding AGC
and to permit the two-band compressor to perform all of the gain riding. This will
prevent excessive reduction of dynamic range, and will produce the most natural
sound achievable from the Two-Band structures.
With faster 2B R
EL
stantially with the amount of gain reduction in the two-band compressor. This
means that you should activate the gain-riding AGC to ensure that the two-band
compressor is always being driven at the level that produces the amount of gain re-
duction desired. Decide based on listening tests how much gain reduction gives you
the density that you want without creating a feeling of over-compression and fa-
tigue.
Release in the two-band compressor automatically becomes faster as more gain re-
duction is applied (up to about 10dB). This makes the program progressively denser,
creating a sense of increasing loudness although peaks are not actually increasing. If
the gain-riding AGC is defeated (with the AGC O
characteristic to preserve some feeling of dynamic range. Once 10 dB of gain reduc-
tion is exceeded, full loudness is achieved—no further increase in short-term density
occurs as more gain reduction is applied. This avoids the unnatural, fatiguing sound
often produced by processors at high gain reduction levels, and makes OPTIMOD-PC
remarkably resistant to operator gain-riding errors.
2B REL SHAPE ("2B Release Shape") selects a LINear or EXPonential release shape.
causes the Two-Band compressor to release at a constant number of dB per
L
INEAR
second, while E
XPONENTIAL
up as it progresses. The Exponential shape allows you to create the open sound of a
slow release time with program material that is well controlled in level, while per-
mitting the processing to quickly correct excessively low input levels. We recommend
using E
XPONENTIAL
for musical programming, where E
the 2B R
control is set between about 0.5 and 2 dB/second, an E
ELEASE
release shape should cause no problems even with music.)
2B GATE ("2B Gate Threshold") threshold control determines the lowest input level
that will be recognized as program material by OPTIMOD-PC; lower levels are con-
sidered to be noise or background sounds and will cause the AGC or two-band com-
pressor to gate, effectively freezing gain to prevent noise breathing.
There are two independent gating circuits in OPTIMOD-PC Two-Band structure. The
first affects the AGC and the second affects the two-band compressor. Each has its
own threshold control.
The two-band gain reduction will eventually recover to 0 dB and the AGC gain re-
duction will eventually recover to –10 dB even when the silence gate is gated. How-
ever, recovery is slow enough to be imperceptible. This avoids OPTIMOD-PC's get-
ting stuck with a large amount of gain reduction on a long, low-level musical pas-
sage immediately following a loud passage.
control settings (above 8 dB/second), the sound will change sub-
causes the release to commence slowly and then speed
for general-purpose programming. We only recommend L
XPONENTIAL
control), you can use this
/O
N
FF
may create unnatural side effects. (If
3-43
OPERATION
EL
INEAR
XPONENTIAL
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