am new to ps1 emulaters so im not going to be much help but all tell you what i know ? make sure that SPU IR HACK is ticked it switches itself off when you exit the programme and all the sound boxes are ticked in the that screen or config the sound itself <which i always fail > or you can try switching sound driver my Eternal SPU Plugin 1.41 works well with a mojority of games
but the big sound problem im having at the moment is with the Resident evil games sound cuts out or no sound at all
graphics are spot on sound bad
i know what your going through im having the same problem