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UAD Powered Plug-Ins Manual - 381 - Chapter 37: Neve 88RS Channel Strip
Gate/Exp
Hysteresis
(HYST)
The Hysteresis knob sets the difference in threshold for signals
that are either rising or falling in level. Signals that are rising
in level are passed when the level reaches the threshold value
plus the hysteresis value. Signals that are falling in level are
not passed at the lower threshold level. Up to 25 dB of hys-
teresis is available. See
Figure 126 on page 381 .
Hysteresis makes the gate less susceptible to “stuttering” by making the thresh-
old value dependent upon whether the gate is off or on. Raising the threshold
for rising signal levels prevents noise from turning the gate on, while allowing
a lower threshold for falling levels. This prevents reverb tails from being pre-
maturely gated. For example, if the threshold is set at –50 and the hysteresis
is set at 10, the level would have to rise above –40 dB before the signals
pass, and the gate would remain open until the level falls below –50 dB.
This control also activates expander mode. Rotating Hysteresis fully counter-
clockwise switches the gate off and the 1:2 downward expander on.
Note:
Expander mode can also be activated by clicking the EXP label text
near the knob. When EXP is clicked again, the knob returns to the previous
value in gate mode.
Gate/Exp
Threshold (THR)
Threshold defines the input level at which expansion or gat-
ing occurs. Any signals below this level are processed. Sig-
nals above the threshold are unaffected.
Figure 126. Hysteresis in the Neve 88RS Gate