Threshold
Sets the level above which signals will be compressed or limited. Rotating the control clockwise raises the threshold, thus clamping sig- nals at a higher level and reducing the amount of compression or lim- iting.
Ratio (1:1 to ∞:1)
Sets the compression slope, which determines how the output signal will change in relation to the input signal once the input signal exceeds the threshold. The first digit indicates how many dB of input change will cause a 1 dB output change. The higher the ratio, the greater the compression, and the more "squeezed" the sound.
Examples: With a setting of 2:1, a 2 dB input change for signals above the threshold results in a 1 dB output change. With a setting of 1:1, a 1 dB input change results in a 1dB output change (i.e., there is no change to the signal dynamics). With a setting of ∞:1, the output level remains virtually constant regardless of input level changes.
Attack (0.1 ms to 200 ms)
This control works only with the Peak/RMS switch (section 1.5) in
5