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Re:Source code for Quake 2 rerelease by rasz on Friday August 11, 2023 @03:07PM (#37092586)
Original Doom used proprietary DMX audio library https://doomwiki.org/wiki/DMX, didnt stop Carmack and Raven from releasing sources.
Re:Source code for Quake 2 rerelease by jsheard on Friday August 11, 2023 @03:31PM (#37092906)
Per the article they only open sourced the Linux port, which had already had DMX stripped out and replaced with an open source alternative.

Engines have grown a bit more complex since then anyway, there isn't an open source library that could easily replace Wwise.