The culprit is a US Duo. It's been region-modded. It's had the caps replaced and a new laser put in. And yes, I've tried cleaning both the game and the system.
I'm playing Ys I and II. I'm almost near the end of Book I. When I found Reah/Lair in Darm Tower (the part where she gives you the glasses) the audio track containing her dialogue... it doesn't want to play all the way. The first time, it skipped and loaded up a music track from way later in the game. I reset the console multiple times and went through this scene but each time it cops out at some part or other, often leading to a long scene where she silently mouths. I had to just put the game in my computer's drive and play the track manually to hear the dialogue.
It does the same thing on Dark Fact--his dialogue just skips around and sometimes he just stops talking, but the animation of his mouth moving still plays.
None of the other voiced bits so far have had a problem.
I repeat: on this duo, the caps have been replaced, and it recently had a new laser installed by one of the users here. So that shouldn't be the problem.
I'm wondering if there may be some simple solution that I should try.
Thanks in advance for any advice.
(Additionally: How do you *use* the glasses? She says they let you read the Books of Ys but I can't figure out how)