The static comes from dirty power. The power you get from the walls in your house is dirty. It jumps around in voltage; it isn't a clean even signal. In a recording studio the power is regulated so its clean, and you get less of that annoying hum. If you have a laptop, try recording running on the battery. You will notice the difference. Also, Adobe Audition has some noise plug-ins that it comes with. You lose some of the dynamics of the vocals when you use them, but if your careful you can get rid of a lot of that hum.