i don't know how to spell this..
but i think for 100 bucks you can get a few sheets of homasote board from home depot.
this should cut alot of the 'leakage' thats annoying your neighbors..
i'd cut it up and place a few panels around the window- stuff the window with a blanket then put these in front..
do the same with the door...maybe put them on hinges so you can still use the door..
and if they still complain....after you sink some cabbage into your basement...
complain when they mow their lawn
'damn mower is sooo loud!'
i never understood this- music is a bad noise- a lawn mower is an acceptable one..
get some of that board from home depot...and unless your playing at 2am with your buddies don't worry about it..
just thoughts..
