Compressor side chain parameters in Logic Pro for iPad

The side chain parameters allow you to use the signal from another channel or bus to control Compressor.

You should note that side chain parameters are active even if no external side chain source is selected. As with hardware VCA compressors, the (compressor) audio input is “normal-ed” as a side chain source when no external side chain signal is patched.

Note: Not all parameters listed are available in each Compressor model.

Compressor side chain parameters

Side Chain Detection buttons: Choose the way stereo side chain signals are handled at the side chain input.
- Max button: Turn on to compress both channels if either stereo channel exceeds or falls below the threshold.
- Sum button: When enabled, the combined level of both channels must exceed the threshold before compression occurs.
Peak/RMS buttons: Use in conjunction with the Max and Sum buttons. Choose Peak or RMS to determine whether signal peaks or a signal average is used for detection. These can help with avoiding artifacts such as clicks in the processed signal, depending on the type of audio material and parameter settings (notably Attack).
State buttons: Turn the sidechain filter on or off. Tap Listen to monitor the side chain signal.
Filter mode buttons: Choose the type of filter used to process the incoming (or internal) side chain signal. Filtering the side chain input signal can enhance the precision of trigger signals, resulting in more surgical compression. The choices are LP (lowpass), BP (bandpass), HP (highpass), Par EQ (parametric), and Hi Shelf (high shelving).
Frequency knob and field: Set the center frequency for the side chain filter.
Q knob and field: Set the width of the frequency band affected by the side chain filter.
Gain knob and field: Set the side chain filter level when Par EQ or Hi Shelf mode is active.

Download this guide: PDF

Helpful?

Logic Pro User Guide for iPad

Compressor side chain parameters in Logic Pro for iPad

Compressor side chain parameters