Origin Effects compressor pedals are designed to be quiet and hum-free, however, the nature of a compressor is that it will amplify any quiet signal entering it. If noise or hum is entering your signal chain before the compressor it will become louder when leaving the compressor circuit. Best practice is to place a compressor pedal before any devices which could be adding hiss, hum, or noise. Likely culprits are distortion-based effects such as overdrive, fuzz and distortion pedals. Hum picked up by singlecoil pickups will also be amplified by a compressor pedal. Try your pedal straight into an amplifier with a humbucker-loaded guitar to see if the noise disappears.