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E11EVEN SOUND \ IO-48 \ User’s Manual
COMPRESSORS
Compressors are used in professional to compress the dynamic range of a signal - that is - stop the loud
parts getting too loud in a bid to prevent sudden unwanted jumps in level. In the iO-48 there is one
compressor available per input channel.
The parameters that need to be adjusted are
the threshold, attack and release times, ratio
and knee.
One of the most misunderstood parts of a
compressor is the parameter usually labelled
the ‘Knee’. This may be a fully variable
control, or a switchable parameter, normally
with ‘Hard’ and ‘Soft’ settings. The knee
control permits a softening of the compressor
action, which can prove to be especially
useful at high compression ratios.
Without the inclusion of a knee control, at the
threshold of gain reduction, a sudden
transition occurs between unity gain and the
ratio by which the compressor attenuates.
When using high compression ratios, the use
of a hard knee can result in a very unnatural
sound.
Check the difference between the “knee” in
channels A&B vs C.
Note: As compressors are affecting all the
acoustical chain, these blocks could affect all
the outputs. The majority of the times is
better to use DEQ for each output.
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