Empress Effects Compressor - Manual (Page 6)

Quickstart
Added Control: Here’s a good starting point for adding consistency
and sustain to your playing while retaining dynamics. Adjust the
input level so the “gr” meter shows 8dB of gain reduction when
playing your loudest.
Chicken Pickin’: Here’s one for a nice compressed country sound.
Adjust the input for 10dB of gain reduction when playing your
loudest.