In the audio titled "EX1_Add_Coin", the sharp, metallic clink of a coin being inserted into a machine is heard. It's followed by the distinct sound of the coin falling, bouncing slightly, and then finally settling. It's the familiar sound that evokes imagery of a coin-operated device, like an arcade game or a vending machine, accepting a coin. The mechanical whirr that follows suggests the machine processing the coin, preparing for the user's next action.