BSS Audio OPAL Series DPR-522 Owner's Manual - Manual (Page 17)

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6.11 Hold
After the attack time is completed, the DPR-522 keeps the gate fully open for
a time determined by the HOLD control. Hold is required to avoid the DPR-
522 from starting another attack sequence if the key signal momentarily falls
below the threshold level.
The hold time is reset every time an above threshold event is detected and
therefore if there is never a pause in the program longer than the hold time,
the gate will never shut.
Short hold times can be used to help minimise jitter (the gate repeatedly
opening and shutting very quickly). Longer times would be used when gating
for example a vocal, to avoid the gate closing between words.
6.12 Release
This is the final phase of operation and is entered after the HOLD time has
expired. At the end of the time set with the RELEASE control, the signal will
be reduced by the amount set on the RANGE control. During release the
signal is reduced logarithmically. This produces a very natural sounding fade,
essential for long release times.
Depressing this switch will force the DPR-522 to commence its attach phase.
It will stay open until the switch is released. Once released the DPR-522 will
commence its hold and release phases.
Open check is especially useful for listening to the input signal if the DPR-522
is setup to be triggered by a signal other than the program. It can also be used
during live performances as a means of forcing open gated microphone lines
to test their integrity.
6.13 Open check