I have the same door chime (ding-dong) that they use in all the TV shows and commercials. Every time their door chime rings, I wonder if mine is ringing. How can I change the sound. It is a Nutone chime, with two vertical bars struck by a double ended plunger. The vertical bars are next to two reverberation chambers each about 6" high.
I have a hacksaw, blowtorch, sledge hammer - all the delicate instruments that might be required.
Hendrik