The Edit CD Properties window can be used to set pre-gaps, and enter ISRC and UPC information.

What is a pre-gap? A pre-gap is the period of silence that usually separates songs on a disc. Most commercial audio CDs separate songs with a two-second pre-gap. When copying a typical music disc, two-second pre-gaps may be fine. But if you are recording a live concert, you may want to set the pre-gaps to zero.

What is ISRC? ISRC stands for International Standard Recording Code. This 12-digit code is used for identifying individual audio tracks to help ensure the proper payment of royalties.

What is UPC? UPC stands for Universal Product Code. This unique number is usually found near the product bar code. One of its uses is to track the sales of commercial audio CDs.