We found these other (non-review) articles that are linked to this gear:-
How It Works: the Noise Gate - Part 10
Feature | Topic: Effects Processing, MIDI, Sound Fundamentals | Sound On Sound, Oct 1988
What is a Noise Gate? What on earth is a MIDI Noise Gate? David Mellor supplies the answers and explains some standard and not so standard gating techniques, with special reference to the BSS Audio DPR 502 MIDI Noise Gate.