- Getting sound from an application to the physical world. This covers sound systems like PulseAudio, JACK, etc. as well as audio drivers and tools such as mixer and volume control.
- Manipulating files that represent sound, e.g. converting between sound file formats.
We should disambiguate these, as they are different topics that don't overlap so much. The sound system/driver meaning is predominant. What tag names should we choose? Are there other, less common meanings?
The tag video is muddier to me, I'm not certain whether it should be broken down and if so, how.