Question: what are the clues for the secret sound?
Answer: The day is over, so ring it. On the stock market, the CLOSING bell is rung at the end of the day.
Roll 'em. The CLOSING credits roll at the end of a TV show.
Last shift of the day. ... 
Lots and lots of autographs. ... 
Not the opening. ... 
Catch up speed. ... 
One last call for alcohol. ... 
It's your house now.