Hello,
Firstly, thank you for this wonderful project, I know it started long ago but do not rush, the more we wait the better it’ll be .
I’d like to talk about something that will be as much important as the “graphical enhancement” you are producing for some players : the audio quality *. https://en.wikipedia.org/wiki/Audio_compression_(data)
I don’t know anything about source engine but I guess that if it does not support WAV you could however get the original tracks of the download section and upload them as WAV or Flac files.
As for the game lossless audio would obviously be great. It would make the experience even more magical . For instance in lossless WAV there will be much more reverb with footsteps on a ladder.
Thank you for considering my suggestion .
*As with movies and pictures there are two kinds of compression for music : lossy and lossless, mp3 and divx are lossy (yes, even 320 kbps mp3 ), WAV and DVD images are lossless meaning nothing is lost. (Up)converting from lossy to lossless is useless because the source itself is lossy, the quality is irreversably altered.