BSS Audio DPR-504 Owner's Manual - Manual (Page 19)

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Notice, that once the attack sequence has been initiated by an event (that is
the key side-chain signal has exceeded 0dB on the key level meter) it will
continue through to the end of the timing cycle regardless as to whether the
key signal has since fallen below 0dB threshold.
Similarly, the hold sequence continues for its set duration, and avoids the
starting of another attack sequence should the key signal momentarily fall
below 0dB threshold.
Release will commence following the ending of a complete hold timing
period, but it will be overridden by another attack sequence should this be
initiated by a subsequent event.
Fig 7.2b Gate timing
stages - multiple
transients