UAD Powered Plug-Ins Manual v5.2 - Just Music

Gate/Expander
The gate/expander module operates in either gate or expansion mode. In
gate mode, signals below the threshold are attenuated by the range (RGE)
amount (see Figure 48 on page 173), and hysteresis is available (see
Figure 49 on page 174).
Expansion mode is enabled by rotating the hysteresis (HYST) control fully
counter-clockwise (or clicking the EXP label). In expansion mode, the gate applies
downwards expansion at a fixed 1:2 ratio, with the amount of gain reduction
determined by the range control. Two attack speeds and a continuously
variable release time are available in both modes.
Figure 48. The Neve 88RS Gate/Expander diagram
Gate/Exp
Enable (G/E)
This button activates the gate/expander module. The module is
active when the button is gray and the green indicator illuminates.
You can use this button to compare the gate/expander settings to that of the
original signal, or to bypass the module altogether. UAD DSP load is reduced
when this module is inactive.
UAD Powered Plug-Ins Manual - 173 - Chapter 19: Neve 88RS Channel Strip