I recently purchased a Mxl 909 Condenser microphone and I'm gonna be running it through a Samson C-Valve Tube Preamp. But I am gonna be doing my recording in my room, I live in a second story apartment building in an area thats not too busy but not really quiet. at times I can clearly hear children outside playing, and music from adjacent apartments and car stereos outside. Additionally I have a pc thats not that quiet either, and I cant afford to buy a real isolation booth but I still want to keep all other outside sounds out of my recording or to a minimun, I heard I can put like comforters on walls or something, but is there any basics I should know to keep my room as quiet and isolated as I can, cheap ways.