I use this in front of my amp. I have tried a lot of noise gate pedals, this one works really well. I use it for when I have a few pedals on at the same time, takes away the white noise from compressor pedal into distortion into delay. Does not cut my sustain abruptly off, like some of the others did. I try a lot of different pedal configurations on at the same time, and this works extremely well at keeping the noise away. Very pleased with it.