Using the below steps you can change the Circulation Warning Sound to a more distinctive sound if you would like.

1. Load LibCode Suite / Utilities
2. Select 'Setup / Circulation Options'
3. Choose 'Circ. Warning Sound' and simply choose what you think will be the most distinctive warning sound for use in Circulation.

This sound will be heard when any error or pop up occurs in Circulation, such as a loan you are returning being found to not be on loan at all.