The version of Mac OS X being used is 10.8.5.
When I click the back button on an empty terminal windows if give a alert sound which is the 'Funk' sound in the System Preferences -> Sound -> Sound Effects
I tried going to the Terminal Preferences -> Settings -> Advanced where there is a checkbox for turning the Audible/Visual Bell but not change the audible bell.
Can this sound be changed to anything else in the Sound Effects list like Submarine, Tink etc.
Best Answer
It looks like for macOS Sierra you simply need to change the Alert Sound under the Sound System Preferences (System Preferences > Sound > Sound Effects).