Pops between CD tracks

[BookSix]

I have noticed pops when my CD's switch from the end of one track to the begining of the gap between songs.

I mastered everything in protools, printing everything to track rather than bouncing by routing everything through an aux track with all my mastering plugins, then to an audio track. I put volume fade in/outs on the aux track at the beginning and end of each song so that when I actually start recording, the volume has a few ms at -infinity and then climbs. Same with the end, the track ends after the volume has reached -infinity. I figured this would guaruntee no pops. I export these files and put them into toast. Burn and check....POPS! Can anyone help? Thanks