DT Videolabs InstaCue - Manual (Page 12)

Set Alert Volume to zero
Uncheck: Play user interface sound effects
Uncheck: Play feedback when volume is changed
Set Output Volume to full.
CDs and DVDs: Set everything to Ignore
Although not in System Preferences, it’s best to unmount any network shares before going into show.
Sound
CDs and DVDs
InstaCue 1.1 Users Guide
Page 11
The following settings are under Sound and ‘CDs and DVDs’ in the Hardware Section of System
Preferences: