You may have luck with his BBS, it's linked at the bottom of the home page.
Thanks. Tried that as well but didn't get a response (and most of the conversation in other threads seemed to be Chinese which unfortunately I didn't understand)
It was more likely Japanese but that doesn't help you.
ChaN, if you're out there:
https://i.imgur.com/E8Z29VE.png
The original code fails to load WAV's containing metadata – even though an intent to tolerate them appears written into some of the handlers (DISP, LIST FCC, etc). I can provide files from Audacity which reproduce the issue.
Moved remaining details here to avoid boring the HN audience: https://pastebin.com/raw/XdneQ8xh