i don't run them inside unless i'm by a vent or yes the lower volume music. but i've done some with double windscreens and it has muffled the sound a bit..
someday i'm gonna make a wind screen, using mic pop filter silk, and a wind screen, i was going to base it on the blimp windscreens in that i have an outer protection (the pop screen) which would reduce most of the wind, and under that have a space and then a smaller screen to reduce anything else that might be there. when i do, i'll be sure to post pics, and maybe make some extra's and let you guys try them if you wish. when i get all moved out, and back in, i'll try and do that.
matt