Specifications

Chapter 6: DigiRack Real-Time TDM and RTAS Plug-ins 69
Compressor/Limiter III Controls
This section describes controls for the Compres-
sor/Limiter plug-in.
Input/Output Level Meters
The Input and Output meters show peak signal
levels before and after dynamics processing. See
“Levels Section” on page 65 for more informa-
tion.
Unlike scales on analog compressors, metering
scales on a digital device reflect a 0 dB value that
indicates full scale (fs)—the full-code signal
level. There is no headroom above 0 dB.
Compressor/Limiter Graph Display
The Dynamics Graph display lets you visually
see how much expansion or gating you are ap-
plying to your audio material. See “Dynamics
Graph Display” on page 66.
Threshold
The Threshold control sets the level that an in-
put signal must exceed to trigger compression or
limiting. Signals that exceed this level will be
compressed. Signals that are below it will be un-
affected.
This control has an approximate range of –60 dB
to 0 dB, with a setting of 0 dB equivalent to no
compression or limiting. The default value for
the Threshold control is –24 dB.
An orange arrow on the Input meter indicates
the current threshold, and can also be dragged
up or down to adjust the threshold setting.
The Dynamics Graph display also shows the
threshold as an orange vertical line.
This control ranges from –60 dB (lowest gain) to
0 dB (highest gain).
Ratio
The Ratio control sets the compression ratio, or
the amount of compression applied as the input
signal exceeds the threshold. For example, a 2:1
compression ratio means that a 2 dB increase of
level above the threshold produces a 1 db in-
crease in output.
This control ranges from 1:1 (no compression)
to 100:1 (hard limiting).
Threshold arrow on input meter
Threshold indicator on Dynamics Graph display
Threshold
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Threshold