This is an incredibly vague ask, as I have almost no concrete details, but maybe one of y'all out there will know what I'm talking about right off the top of your head.
Once upon a time when I was a wee little hatchling, I had a box for some sort of rpg. I don't know if it was D&D, or just some OTHER fantasy rpg, but IN that box, amongst the material that was too advanced for me, was a CD that I listened to. It might have had some music, but more than music I remember tracks of characters talking. It was NOT a coherent story- the blurry impression in my mind was that it was kind of 'prompts' for a set of premade characters that came with the box, beginning each scene, but then cutting off dramatically because the players were actually supposed to play out the stuff that connected the encounters (is what I'm guessing). The most vivid thing I can remember is that the last track that involved talking (I think) ended with some big monster attacking the party while they were in a dungeon or a sewer.
Ring any bells?