I started again playing various Civ2, Civ2 TOT, Civ3, and one or two Civ4 games since jan 2023. That's after playing all Civs up until 2006 (board games filled in). Have many retail versions of Civ CDs and DVDs. More than once my sound problems have been resolved by sticking in a different disc. This include various versions of Civ2 and Civ3.
Had a problem with Fantastic Worlds sounds and stuck in every Civ2 disc I had until the Civ2 MPGE disc resolved it. This has worked with Civ3 versions as well.
aside to Blake: Currently on my 2nd COMM3 game standard size 4th difficulty level wow it's great. You Blake alerted me to its coolness... A couple of times my sound here started clicking skipping; turning off the sound and back on or exit reload fixed it. For me.