So I searched for this but either my search skills are lacking or no one has had this issue. I'm sure it's the former. So, you know the sound of CO2 filling the head space of the keg when you first hook it up to the CO2 tank? Every time I take a pour off one of my taps I hear that sound for a short period. I have three kegs hooked up to my four way manifold and I don't recall hearing that sound when I pour off one of the others. I took a spray bottle with some starsan and hit the usual suspects but didn't see any bubbles. I haven't noticed my tank losing gas abnormally fast though. Has anyone else encountered this or have any suggestions?