This category contains, for instance, 01:31, 2 Nov 2004 (UTC)

I think the best way to find out is to see how the best known equivalent, (MP3) is categorized - currently under union of digital audio, and audio codecs. Both of those cats fall under the technology category as well. I believe the Sound category should stick closer to the physical def n rather than the technical derivatives or treatments. In that light, Digital audio is kind of pushing it as well.

=Acoustics=