Compressor Build RFI question

[ggarms]

So I've found myself building more and more comps lately for friends, and each time I do the keeley 4 knob version on tagboard I end up with RFI. The build itself sounds great, however when timberlake starts crying river through my amp when I'm not playing, I tend to get frustrated. I've been trying to figure out the best way to solve the problem, and it seems like a lot of people are mentioning adding a small resistor in series with the input or a small value cap between input and ground. Can anyone explain to me exactly how this is done and why this would work?

[ggarms]

It isn't too bad unless i'm using distortion, at which point it becomes obnoxious.