Glad you got it sorted. Happy to help.

@BuZz I find it strange that happened. I never messed around with those configuration files because I didn't want to break anything.
Sure enough, I went in and changed the volume to 100 and it's back. Thank you very much.

@Lyle_JP

The ISO format doesn't make use of a cue sheet. Because of that and a few other format differences, they're really only useful for imaging unprotected, single track CDs and DVDs. You can convert between the two formats, but you'll always get data loss with anything more complicated than a single track disc.