No need to thank me, I just felt like writing something. My PC is not nearly as powerful as yours, so I had to deal with low FPS and audio stutter all the time (it was just a little better in space missions. ) The Taloraan mission is the only one that played at a speed remotely close to 100% (and at full speed when facing away from the platforms.)
Try playing around with various hacks in the config menu, maybe one of them, or a combination of some of them will fix your explosion problem. Using save states can save you a lot of time here.
I'm rather convinced that it has more to do with the visual effect of the explosion, as opposed to the sound effect. I can't really replicate your problem, since with my slower PC the emulation performance is so consistently bad, that any slow-down caused by explosions is hardly noticeable.
Try playing around with various hacks in the config menu, maybe one of them, or a combination of some of them will fix your explosion problem. Using save states can save you a lot of time here.
I'm rather convinced that it has more to do with the visual effect of the explosion, as opposed to the sound effect. I can't really replicate your problem, since with my slower PC the emulation performance is so consistently bad, that any slow-down caused by explosions is hardly noticeable.