Metric Halo Production Bundle - Manual (Page 110)

Processing
110
The Fast Release and Slow Release controls define the thresholds that the audio must be within to be considered
“sustain”, while the Attack control sets how long the envelope stays open.
You generally will not need to change these controls from the default values.
Sustain Gain
This control allows you to boost or cut the level of the audio that falls within the sustain detector's envelope.
The gain range is ±300%
Output Gain
This control allows you to boost or cut the output level after all processing has been applied. The gain range
is ±24 dB