This is what the instructions say about this:

If your CD recorder supports it (unfortunately, very few drives do), you can add a hidden track by adding audio in the space before track 1. When the CD is inserted in an audio CD player, it will automatically start at track 1, but you can find the hidden track by rewinding past the beginning of the first track.

Most CD recorders require that the space before track 1 be exactly two seconds, which eliminates the possibility of hiding tracks at the beginning of a CD. Check your CD recorder's documentation for specific information about your drive.

Unfortunately, I can't find out what cd burners will support a hidden track before track 1. If I find out I'll post it, if someone else does, I'd really like to know also...