10.6

Table Of Contents
81Logic Pro Effects
Logic Pro Compressor main parameters
The main part of the interface contains the core compression parameters. You can choose
the type of compressor circuit and can adjust the settings.
Note: Not all parameters listed are available in each Compressor model.
Compressor parameters
Circuit Type buttons: Choose the type of circuit emulated by Compressor. The interface
updates when you choose a model. The choices are Platinum Digital, Studio VCA and
FET, Classic VCA, or Vintage VCA, FET, and Opto.
Platinum Digital: A clean-sounding compression type with a fast transient response.
It can be used on a variety of sources.
FET: Field Effect Transistor compressors are known for their fast transient response.
They can deliver a clean or colored tone (notably midrange signals), and can be
pushed toward a “crunchy” tone on transients. Ideal for drums, vocals, guitars,
and other signals with a fast attack phase. FET compressors can only attenuate
the signal.
VCA: Voltage Controlled Amplifier compressors can respond slowly or quickly to
incoming transients. They tend towards a clean tone and are well-suited for bass
guitars and low-frequency signals. VCA compressors can attenuate or amplify
the signal.
Opto: Optical compressors are known for their fast transient response and non-linear
release handling. They are very clean and are ideal for vocals and guitars. They are
also often used as limiting amplifiers across buses or outputs.
Side Chain and Output buttons: View Side Chain or Output parameters.
Gain Reduction meter/graph: Click either the Meter or Graph button to change the
real-time compression amount display.
Input Gain knob and field: Set the level at the compressor input.
Input Gain meter: Displays the level at the compressor input.
Threshold knob and field: Set the threshold level—signals above this threshold value are
reduced in level.
Ratio knob and field: Set the compression ratio—the ratio of signal reduction when the
threshold is exceeded.