Open Toast 9. Toast will be located on your computer in the Applications folder.
Select preferences and choose "Audio & Video" from the File Menu drop-down.
In the Audio & Video section check the box "Show advanced mastering settings."
This is not checked by default and is what allows us to add the ISRC codes.
You may now enter all of the pertinent text information, provided that you have checked the box in the lower left-hand corner of the interface.
Once you have these preferences set up, you are now able to add the very pertinent ISRC codes.
These codes will be added in the same drop-down menu as the TOC/PQ menus.