I kinda figured it out. It works in the prior stable version (ScummVM DS 0.11.1) but not in the current version. No idea why but just a tip to anyone who may run into this problem in the future.

Okay, I ripped the audio track exactly to specifications using the recommended program. The in-game console tells me the file is exactly as it's expected to be. When I run the game, I can hear the bgm and the first three lines of her opening dialogue by moving around as per usual, but if I click on ...