The audio package in Bio Freaks is, on a whole, very good. The dynamics are decent and, despite the odd glitch, the sound is loud and clear. Surprisingly, there's not much to choose between the N64 and PSX versions sound-wise. The soundtrack is about what you'd expect, techno-metal in keeping with the theme and mood of the game. Kudos for the loopy, demented, carnival-like music that accompanies Psyclown.
Sound effects are good but nothing remarkable.
There's even some speech involved which, although sometimes hard to decipher, is amusing. It's intuitive and easily navigable. You'll have no difficulty finding the option you're looking for. For lack of a better description, they lack intensity. Overall Bio Freaks is a classic 'rent me first' title.