Sorry to dredge up such an old thread, but I recently played through this game for probably the 4th or 5th time. I love it! Great CD music (and kind of crappy PSG music, but oh well). What people who play this game commonly forget to do is go look at the records room. Read about everything in there (Rape, stolen car, stolen knife, etc etc). Later in the game there will be more to read through in the records room. This is absolutely essential. After that, go back out and start asking questions.
Are the voices in this game done by the ADPCM in the Turbo CD expansion unit, or are they done by the Turbo itself? The voices seem to have a ton of buzz and static, and I have heard cleaner voices in a few HuCard games. The CD music (like the tune for the credits) also have the occasional clicks and pops due to poor mastering or maybe poor replication. But with a little bit of clever audio editing they can be removed when you throw them on your iPod or MiniDisc or whatever.