The sound is very low because the rating drops if you miss an order or the customer hangs up. It is the Pizza Frenzy sound for the message such as wrong pizza or miss an order similar to the video game like Puzzle and Board XP Championship, also developed by Selectsoft Publishing when the player using Bingo to complete a line. The sound when the rating drops is down before your career in pizza delivery will be over instead of the end of a game sound. Think about it.
