BSS Audio DPR-504 Owner's Manual - Manual (Page 22)

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This allows the gate to be triggered by an event that is not the same program
event connected to the input connector.
In application this allows the gate channel to be controlled by two other
methods. Firstly, a totally independent signal can be connected at this point,
such that the gate will be triggered open by an event which is not related to
the program appearing at the input connector. Secondly, extra equalisation, or
time delay can be added with the existing internal signal to enhance the
selectiveness of the gate switching.
7.10 IN
This switch selects whether the gating action is active or not. When the
switch is 'out', the gate will be held permanently closed allowing the program
signal to pass uninterrupted. When the switch is depressed, the gate will be
active and controlled by the key level signal.
In application this switch can be used to check that signal lines are active, or
to temporarily suspend the action of the gate.
Repeated switching will also allow checking of the dynamic action of the
gate, as the set attack and release times will be operative on the opening and
closing sequences.
Operating Instructions