Once the server-side source components are lost to time, at best we'll be able to view linear recordings of what the combined system did for this one user that one time. Perhaps I'm jaded by the lens of my present-day perspective but, the only small comfort I find in this, is that so many of today's recent online experiences are largely derivative of each other.
By analogy to film archiving, if (for example) the original master print of the 13th (out of 20) MCU Phase 1 film were lost to time, I feel it'd be less tragic than the fact we don't have a full-length print of Fritz Lang's 1927 classic Metropolis, arguably the first ever feature-length science fiction film. At least we have the vast majority of pre-2000-ish arcade, computer and console video gaming digitally preserved as complete interactive emulations. That era was the creative crucible where much of video gaming first evolved.
GWave:
https://youtu.be/ZRDdKZ7V54I?t=1247
>"Three different tables are required to output sound:
1) Wave Table
2) Sound Vector Table (Synth Presets)
3) Frequency Pattern Table"
The Walsh Function sound machine:
https://youtu.be/ZRDdKZ7V54I?t=1449
Related:
Microcomputer-Controlled Sound Processing Using Walsh Functions, Maurice Rozenberg, 1979: