Well to me this static has just as much to do with your power source and power outputs. So you are using line in capable sound card that is almost the same as using a mixer station/interface. I am confused as to whethermeaning you have a guitar amp that has a mic on the speaker. Or are you saying that you have a guitar plug straight into the sound card and a mic separate for like vocals.I am attempting to record a guitar and a mic through direct input to my pc
The main thing here is that we need to know whether the amp is making a hum or that there might be a ground loop problem in your setup. If you are plugging in a single coil guitar there is always the presence of ground hum that comes with that setup. Lets stop there and find out how you are plugging your guitar into your system... Either directly in or into an amp that mics the output into the sound card. There is a big difference in the answer to what you might need to improve your sound.