Maybe your audio drivers have issues supporting OpenAL, which is the audio standard used by GSX.
Not all applications use it, which explains why you might think it's a GSX problem, only because it might be the only installed app you have that use OpenAL, so it would be affected if your audio drivers had an issue with it.
Sometimes audio drivers that comes with Windows work better than the custom one provided by the audio card manufacturer. Sometimes is the opposite so, there's no general rule, you should just try.