BSS Audio OPAL Series DPR-944 Owner's Manual - Manual (Page 14)

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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.
6.6 Depth 20dB
With the gate ‘open’, the program can pass through DPR 944 unhindered.
When ‘shut’, the level of the program passed is selected to be either
approximately -80dB with the depth switch out, effectively no signal at all, or
-20dB with the switch depressed.
The 20dB position is often used to avoid the signal sounding ‘dead’ when the
gate is shut, or to enhance or make less audible the gate dynamics.
Remember also that if a very fast attack time is desired, it will take the DPR
944 longer to open from -80dB than from -20dB.
6.7 Attack slow
Once the key level exceeds the threshold, the gate will start to open. The
time it takes to open is determined by the attack switch. For conventional
gating, the fast attack (switch out position) is usually desired to ensure that the
minimum wanted program is lost. However, unnecessarily fast attack times
should be avoided as they can produce a ‘click’. This click is not generated
by the DPR 944 but is an artifact produced by the action of quickly switching
a signal. Mechanical switches as well as fast electronic ones like the DPR
944 will all exhibit this phenomenon. If this is a problem, increase the attack
time by depressing the attack slow switch.
The attack phase, once initiated, will continue until the gate is fully open,
even if the signal momentarily falls below the threshold level. This is
important as it allows for both a clean 'chatter-free' attack phase and ensures
that, especially with short hold and release times, the gate does not try to
follow individual cycles of the program.
Control operations - Gate