If you are sure that sound is coming from GSX, is more likely a problem/bug with your audio card drivers. GSX uses OpenAL for sounds, which a standard library used by many games, but proper OpenAL support must be provided by the audio drivers.
Sometimes the audio drivers provided with the audio card (or the mainboard, if it's embedded) are best, sometimes it's best to use the ones supplied with Windows, you can only test which one has best/reliable OpenAL support.