Hey man, a slight static eh? A good way to troubleshoot it would be to first try changing your volume levels.
Are you using the EQ on foobar? If you are, then have you zeroed it? Meaning, having it only lower the levels on some frequency ranges and having the highest frequency range at +0dB. In addition to that, check if the volume of any part in the chain is at the maximum level, if so, lower it/them all, set foobar to -5dB. This is all just to make sure the static doesn't come from any excessive software/hardware amplification.
Another thing is interference, sometimes especially laptop setups can take electronic interference from various things in your room that are connected to the same electricity grid, do you hear the static when your laptop's power cord isn't plugged? I had problems with static with one of my desk lamps, when it was plugged to the same extension cord as my laptop, I heard an annoying static from all my audio sources.
The last thing is the PC350 volume dial gadget, that can easily produce all kinds of unwanted sounds over time, because it gathers tiny dust particles inside the dial mechanism. Blow air into it and roll the dial around, do this for a minute and see if this affects the static. Has happened to me a few times during all these years I've owned the headset, it needs a bit of a cleaning if stuff gets into it.
Other than these things, I'm not sure what it could be. I've never had anything else causing static problems on any of my headsets or headphones.