Voice emulation has long been a problem, due to the fact that speech is very hard to emulate properly. But the next version of ePSXe is supposed to have increased sound compatability, so maybe voices will work better. For now, give Iori's SPU 140b a try. I tried it w/Castlevania SOTN and the speech between Richter and Dracula was perfect. So was the music as the words scrolled up the screen. Up to this plugin, none had been able to get these two things to sound right. But this one did. So try it out and see what you think. I know I'm impressed.
sincerely,
sx/amiga