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R
ATIO
A Ratio of 4:1 means that if input level is 4 dB over the threshold, the output signal level after compression
will be just 1 dB over the threshold. The gain (level) is reduced by 3dB. Very high ratio settings are the reason
the word “limiter” is part of the title for this feature. The highest ratio setting will effectively reduce any
signal that would rise above the threshold all the way down to the threshold level (with the exception of a
brief period during a sudden increase in source loudness, as dictated by the Attack setting).
A
TTACK
Attack (like Release) is labeled in milliseconds. The setting represents the amount of time it takes for the gain
to change by a specified amount.
It would not be grossly incorrect to think of this setting as changing the slope of a graph depicting how
aggressively the compressor pursues the target value (defined by applying the Ratio setting to the amount
the signal surpasses the Threshold). Shorter values are more aggressive, while longer values are more subtle
(and tend to be less noticeable to the audience).
R
ELEASE
Release is similar to Attack in many ways, but refers instead to the speed with which the compression effect
is removed as a source signal falls back on its own so that it no longer exceeds the Threshold.
G
AIN
Naturally, compression impacts the overall output level of the source or output. The Gain control allows you
to compensate, bringing the post-compressor/limiter signal back to a comfortable nominal range.
Hint: Different circumstances call for different Attack and Release strategies. For example, much less
aggressive settings could work nicely for vocals, but fail badly when applied to a snare drum. Many
websites provide suggestions on establishing the best compressor/limiter settings for different
environments.
N
OISE
G
ATE
The Audio Mixer’s advanced options panel also include a configurable Noise Gate for each audio source, as
well as all outputs. This lets you ensure that unwanted low-level sounds are prevented from inadvertently
intruding into the mix.
15.7.5
AUTOMATION
Several different per-input automation features
are found in the Processing tab.
F
OLLOW
P
ROGRAM
V
IDEO
Enabling Follow Program Video options for an
audio source directs TriCaster to track switcher operations affecting the
related video source. Audio for sources with Follow Program video enabled in the
Audio Configuration panel is automatically removed from mixed outputs until one
or more specified video sources are actually displayed on Program Output.
FIGURE
15-11