First of all, this is no joke. I purchased a new condo 6 years ago. I live on the 2nd floor of a 3 story building. My problem is the noise that sounds through my heating duct from the apartment above. The sound is that of the man upstairs urinating into the toilet water. It actually sounds as if he is in my condo bathroom with the door open. The duct in my ceiling must be quiet close to the toilet above on the 3rd floor and to the soil pipe. Again, this is not a joke. Any suggestions as to how to deaden this noise?