OP Updated - Added Audio Collection
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I remuxed all of these myself. I named files by 'Character - Date Created - Audio Designer (if I knew who it was)'. If it says 'multiaudio', that means multiple audio tracks were added. You can select audio tracks in your media player, titled by audio designer. Remuxing is a lossless process, so there is no loss in visual / audio quality, in case you didn't know what that is. There's only one video here that wasn't remuxed by me. It's an Aranea video with sound by lerico, and was sort of a sequence of different animations. The quality was very good so I kept it.
Finally, the mediafire link is my own personal archive. It's the only link which I will update retroactively as new audio is found. You can download individual files from both there and pixeldrain. You can check the mediafire link again in the future for updates.