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The Basics of Compression
Compression can add consistency and sustain to
your playing or it can be used to add note definition
and other effects. It essentially narrows the difference
between high and low audio levels by reducing the
gain of any signal over the threshold.
Threshold
Input Level (dB)
Output Level (dB)
1:1
2:1
4:1
10:1
The ratio determines how much gain reduction will
be applied to the signal once it crosses over the
threshold. At a 4:1 ratio, for every 4dB of input signal
above the threshold, there will be 1dB of output
signal. A 10:1 ratio would output 1dB for every 10dB
of input signal, etc.
Attack controls how quickly the gain reduction
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