So what channels do I delete for commentary? The bottom one?
The commentary should be on a completely different track. Hal’s V4 COD edit has three tracks (the edit, the edit minus added pod race music, the commentary). The first two tracks are 5.1 and have 6 channels. The third track is stereo with two channels. Delete the third track and one of the others depending on whether you want the extra music.
Again, I’m just giving broad strokes. Consult google and FE.org to figure out the specifics of your system if you need to.