So I originally had a Behringer noise gate pedal, didn't think it was working correctly, eventually upgraded to a Boss NS2.
I've put the pedal in the effects loop of my amps (a Bugera TriRec and a Blackstar HT20) and have had the same problem with both pedals. I have to have the threshold dialed up all the way to the left to get any kind of reduction and if I set it to mute mode, I get no sound whatsoever.
Am I doing something wrong here?