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CHAPTER 20. LIVE AUDIO EFFECT REFERENCE 252

while the Polarity switch sets (surprise!) the polarity. Polarity changes have the most effect

with high amounts of feedback and short delay times.

The Dry/Wet control adjusts the balance between the processed and dry signals. Set it to

100 percent when using Chorus in a return track.

20.5 Compressor I

The Compressor I Effect.

A Compressor reduces gain for signals above a user-settable threshold. Compression

reduces the levels of peaks, opening up more headroom and allowing the overall signal

level to be turned up. This gives the signal a higher average level, resulting in a sound that

is subjectively louder and punchier than an uncompressed signal.

The two most important parameters are the Threshold and the compression Ratio:

The Threshold slider sets where compression begins. Signals below the threshold are not

processed. Signals above the threshold are attenuated by an amount specied by the Ratio

parameter, which sets the ratio between the input and output signal. For example, with a

compression ratio of 3:1, if a signal above the threshold increases by 3 dB, the compressor

output will increase by only 1 dB. If a signal above the threshold increases by 6 dB, then the

output will increase by only 2 dB.

The red Gain Reduction meter shows how much the gain is being reduced at any given

moment. The more reduction, the more audible the effect; a gain reduction above 6 dB

or so might produce the desired loudness, but signicantly alters the sound and is easily

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Ableton Live - 6.0 Manual de usuario Pagina 254