BSS Audio OPAL Series DPR-944 Owner's Manual - Manual (Page 11)

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Fig 5.4
5.3 Key Insert Both the external key input and key send signals are available on a single
‘normalising’ TRS jack socket, wired as follows:
Fig 5.5
Inserting a plug into this socket automatically breaks the internal connection
between the side chain filter output and gate threshold input, allowing further
side chain processing, or external triggering.
When using the DPR 944 to drive unbalanced inputs, best performance is
usually obtained by connecting the DPR 944s ‘+’ signal to the equipment
signal pin and the ‘-’ signal to the equipment shield.
The DPR 944 shield should normally be connected to the equipment shield,
preferably at the equipment end.