The best solution I found is to use OpenAL Software Driver for Vista, FreeAudio for all else. I have code in the codearcs that lets you detect the OS version.
And yes, just use SetAudioDriver. Although to use OpenAL Software Driver, you first need to call EnableOpenALAudio().
And yes, just use SetAudioDriver. Although to use OpenAL Software Driver, you first need to call EnableOpenALAudio().