Use:

paste -s file | awk '{$2=$2};1'

To merge lines from file into one superstring.

Ready example presets are in the shell scripts.

Suggestions:

1. If tracks on CD have different peaks - that means that disc is probably done from the master tape.
2. The longer the master tape was laying around - the worse it gets, the less dynamic range it has.
3. Generally the older CDs have better mastering, and acoustic master tape source was in better quality.