Trying to bump this thread because it's still an issue. I've been trying to get my legit copy of SSRPG to run for a while now. I've ripped the disc about four different ways and in different formats, and nothing seems to work.
There are several points in the beginning of the game that are supposed to be voiced, but when played on the NeoSD Pro, they're silent.
Galford's Dog is just a glitchy mess rather than having a functioning sprite in combat.
If you play the Haohmaru chapter, all of Genjuro's lines are supposed to be voiced after Amakusa shows up at the dojo.
When visiting the shack in the east at the beginning, a young woman walks up to Haomaru and will say "Haohmaru-sama?" The rest of her lines are supposed to be voiced, but instead of playing when she's supposed to say them, her voice lines replace the drums in the battle music.
I was able to get the Raine emulator to run the legit disc from my PC no problem to confirm it's not suffering from disc rot. If I can help in any way by providing a legit rip, please let me know.