The Secret Sound is played Monday to Thursday after 3pm in James' show.  Listen out for the sound, call in and have a guess, if you speak to James and guess correct you could win the cash, which accumulates each day. 
Competition terms and conditions apply.

Wrong guesses so far are:

The beast of Exmoor

A dishwasher draw with cutlery 

A bag of knitting needles 

A tape measure retracting 

Car keys being picked up 

Crushed ice being dispenser 

A one arm bandit lever 

A recycling bin being emptied into the truck 

Nunchuck

A Vending machine

A glove box mechanism 

A cash till closing

A freezer draw closing 

Skittles being racked

A kitchen draw with utenbeing closed