BSS Audio OPAL Series DPR-522 Owner's Manual - Manual (Page 15)

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In normal use the threshold control is generally set so that wanted signal
peaks are just able to trigger the gate, this gives the maximum protection from
false triggering by undesired signals.
6.7 Key level meter
The relationship between the actual trigger signal (as set by the threshold
control) to the gate trigger point is displayed on the KEY LEVEL METER. This
meter displays the level of the key signal in dB relative to the level required
to ‘open’ the gate. This level is the larger segment marked ‘TH’ on the meter.
Notice that even with no key signal present the TH segment glows dimly, to
ensure that even in dark conditions, the trigger point is visible. The meter has
a very fast response time coupled with a decay time optimised to allow you to
see rapidly recurring signal peaks.
6.8 Range
With the gate ‘open’, the program can pass through the DPR-522 unhindered.
When ‘shut’, the level of the program passed is set with the RANGE control.
This can be varied from the full input level in the ‘out’ position to more than
80dB reduction - effectively no signal at all.
Intermediate settings of the range control are often used to avoid the signal
sounding ‘dead’ when the gate is shut, or to enhance or make less audible the
gate dynamics. This is done by limiting the open to closed gain ratio to the
minimum required.
Remember also that if a very fast attack time is desired, it will take the DPR-
522 longer to open from -80dB than from, for example, -20dB.