Compression Controls and Sidechain EQ
The core controls cover the usual compressor functions. Threshold sets the level where compression begins, Ratio sets how strongly gain is reduced above it, and Attack and Release set how quickly the compressor engages and recovers.
Depth caps the maximum gain reduction, which can let you run a lower threshold and higher ratio without over-compressing sudden loud peaks. Knee controls how progressively the ratio takes effect as the input gets louder.
The sidechain EQ is a single-band filter with several shapes, including high and low pass, bell, and high and low shelf. Harrison describes using it to make the compressor more sensitive to sibilant vocals, or to keep kick and bass from triggering gain reduction on a full mix. An external sidechain input lets you use another track as the key source.






