Audio problem - Some CD Audio isn't playing

[elfmo]

I decided I wanted to play Dawn of Ys and Mask of the Sun again, and while making sure I still knew where everything was, I ran into a weird problem with DoY. I'm using the English translation with the English dub, and all the English voices are still there, and any time a cutscene with CD audio music and voice plays, I hear both...but any time it's music without voice, nothing plays. All sound effects are playing, and all PSG music is still playing just fine, however.

This is perplexing to me because, to the best of my knowledge, I wouldn't have modified any files - hell, it took me days to just get the English trans + dub working when I first played it. Has anyone run into this problem? Any ideas?

EDIT: Turns out it's a lot of audio that isn't playing. Stuff I've been able to test:

Opening Movie: No audio
Intro to the game: English VA, all the PSG music plays fine.
First cutscene after the Esteria intro: No audio

I had a save at the very end of the game as well...

Final dungeon: No audio
Cutscene before the final boss: Music & English VA
Final boss fight: No music
Ending sequence: No music

So, I guess it's perhaps more random than I thought.

[elfmo]

So, it turns out my suspicion was right, and that I didn't change anything. It looks like the problem is somehow related to my computer. I have two reasons for thinking this:

1. The version I have has the same problem on every emulator I can get to work. The undubbed version that I have does not have this audio issue.

2. I transferred the version that I remembered working onto my phone, and it works perfectly.

...I really, really don't want to call this issue "solved", because I'd much rather play it on my computer, and I'd also really like to know what could have possibly happened that some of the audio simply doesn't work, but the exact same files work perfectly on a different system. If anyone has any insights on what the problem could be, I'm more than happy to hear them.