i just purchased a boss ns-2 noise suppressor to run through my effects loop to remove the unneeded noise produced by the peavey 6505. When playing a chord there seems to be an increasing volume effect produced by the pedal, where there is a delay in the pedal recognizing the sound. it slowly gets louder after i strum. Is this common or is there a way to remove the issue?

i would think possibly lowering the thresh and raising the decay could help, but i cant seem to find the right setting. this is a problem for playing metal when doing strums and pauses