Buzz Audio essence optical compressor - Manual (Page 6)

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Tips for Using the Essence continued…
•70mS Attack
The slow 70mS position is useful in obtaining more fronts
from percussive sounds. For example, a snare that has
no “stick” sound may be improved by gentle
compression with a slow attack and quick (1 or 2)
release time. The initial transient of the snare is allowed
to pass unaffected but compression is applied to the
“tail” of the sound, bringing the “stick” forward.
•Auto Attack
Best choice for low ratio light compression of sources
like acoustic guitar, bass guitar, vocals and even stereo
mixes. The adaptive nature of the auto position
prevents “pumping” and really is the “classic” sound of
LDR based Optical compressors.
•1mS Attack
Generally, when high ratio’s and heavy compression are
applied to vocals, the fast attack position is the best
choice to prevent sibilance problems. When
compressing a stereo mix, the fast position will help
control peaks in the program material getting through.
•Release Times
Selecting the most appropriate compressor release
time is best achieved by ear but here are some
guidelines.
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Tips for Using the Essence continued…
Stereo Mixes – generally speaking, a release time of
400mS (number 4 on the dial) or Auto is appropriate,
but really does depend on the type of program
material.
Bass Sounds - faster release times will distort the bass
register as the compressor actually starts to track the
bass frequencies, however the effect of a fast release
and the distortion may be the sound you’re looking for!
Vocals & Voice Overs – under heavy gain reduction,
100mS release (number 1 on the dial) will prevent
“pumping” and missing phrases due to the compressor
still releasing from a loud patch. If using a low ratio and
light compression, slower release or the Auto position
may sound warmer. Again, experimentation is the key.
Auto Release – a clever little circuit inside the Essence
provides a quick release from transients and peaks
whilst maintaining a slow release on overall program.
This is similar to an automatic gain control (AGC) type
action, although a lot more intelligent in it’s response.
•Ratios
The graph on the next page shows the input to output
relationship of the four available ratios with the Drive
control set fully clockwise.