Okii, so as you guys have figured out, the walls aren't soundproof xD You can hear eachother, but only certain rooms. These are the rooms in hearing range:
Room 1 can hear room 2 and 4.
Room 2 can hear room 1 and 3. (+ 4 and 5, but only barely)
Room 3 can hear room 2 and 5.
Room 4 can hear room 1 and 6. (+ 2 and 7, but only barely)
Room 5 can hear room 3 and 8. (+ 2 and 7, but only barely)
Room 6 can hear room 4 and 7. (+ 9, but only barely)
Room 7 can hear room 6 and 8. (+ 4 and 5, but only barely)
Room 8 can hear room 5 and 7. (+ 10, but only barely)
Room 9 can only hear room 6. (barely)
Room 10 can only hear room 8. (barely)
The basement can't hear anything ouside of it's walls.