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8 BLOCKS GUIDE
THE COMPRESSOR BLOCK
A compressor reduces the difference between loud and soft sounds by reducing the louder portions of a signal.
The designated reduction occurs whenever the measured signal exceeds a set threshold. While a compressor
reduces the volume of loud sections, it can simultaneously boost overall level for greater perceived sustain.
In guitar pedalboards, a compressor is often placed at the start of an effects chain, though using the effect can
increase noise or even squealing. In the recording studio, a compressor is typically placed towards the end of a
signal chain to smooth irregular levels or provide special effects. This block includes both pedal and studio-type
compressors (detailed below) and allows side-chaining and sophisticated detector signal filtering.
CMP
2 Blocks, 5 Types, 4 Channels
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TYPE PAGE
Type
– Compressor types include Studio Compressor, Pedal Compressor 1, Pedal Compressor 2, Dynamics
Processor, and Optical Compressor.
The Studio type simulates popular high-end “Feed Forward” stereo studio compressors. In comparison, the
Pedal and Optical types simulate classic “Feedback” compressors where the detector listens to the output signal
instead of the input. Pedal 2 uses a smoother detector which pumps less, while the Optical compressor offers
different light types with different control characteristics. The Dynamics type allows compression or expansion
with a single control.
Make a selection using
VALUE
or
NAV
buttons with no need to press
ENTER
.
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CONFIG PAGE
Pedal/Optical and Common Parameters
Compression
– Determines how compressed the signal will be, decreasing dynamics and increasing sustain. Set
low for light compression or high for total squash. An on-screen meter shows gain reduction.
Attack Time
– This sets how fast the compressor reduces the volume once the threshold is exceeded. Higher
settings will produce a popping attack since more of the uncompressed signal has time to be heard.
Release Time
– Determines how quickly the output volume returns to normal once the input level falls below the
compressor’s threshold. Fast release rates allow the compressor to bounce back and produce snappy attack, but
a setting that is too fast can cause distortion if used in conjunction with fast attack times and high compression
or ratio. Slow release times can keep the entire signal quiet, reducing the gain of passages even though they are
below the set threshold.
In general the release rate should be set slightly faster than the natural release rate of the program material. An
easy way to set the release rate is to strum a chord, watch the gain reduction meter (on PG2 of the Edit menu)
and set Release Time so the decay observed is slightly faster than the natural decay of the instrument.
BLOCK DIAGRAM (STUDIO TYPE)
Sidechain
Source
Ext.
Input
Filters
Look-Ahead
Detector Ctrl
Look-Ahead
MI
XER
Содержание Axe-Fx III
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