You don't have audio drivers as you're thinking of them.
There is a means of addressing audio hardware built into the kernel, with a group of settings and quirks for particular hardware as they're discovered, called ALSA. Then there is a piece of software, with its own settings (which ALSA device should be used, whether audio should be resampled to a different rate, and so on), for handling audio streams called PulseAudio.
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