Let me suggest something to you.... skip the foam/closet idea. Get the mic out of the corner. Try to record in the most open space you have avaiable to you, try to stay away from boundaries like walls and ceilings, and stay out of corners, and do not work in the middle of rooms, particularly square rooms. Allow the music some room. It would not hurt to put some absorbing material or a bass trap type thing on the ceiling above the mic to somewhat tame refections.
Bill
_________________________
"...it's easier than hitting the kids, and almost as much fun..."
| 
