I wouldn't change reeds. It will change the sound and feel more than the volume. Might do more harm than good. As far as muting a tenor you can throw a heavy coat over the horn and play through the sleeves or drape it over the horn on a closet in a hanger. This will really cut down the sound. Kind of unlpleasant but nicer than being evicted.

man i do play at 2 am. thats when i play my best actually. i practice in my garage w/ the doors down, so its really not that bad for me. i got lucky on that one. but i'd try that gigbag/mute deal. it seems a bit restricting, but u gotta do what u gotta do. if u can deal w/ the low Bb being impossible to hit, put a sock full of quilt stuffing inside the bell. or a large, poofy nerf ball works 2. jus my 2 cents. by now u've probably solved the problem, but what the heck Joel