By following the links to Cantonese wav files, I noticed that there was a change in the domain names at the Chinese University in Hong Kong. Instead of www.arts.cuhk.edu.hk, you must now link to humanum.arts.cuhk.edu.hk. e.g.
http://www.arts.cuhk.edu.hk/Lexis/Canton/sound/tai3.wav
=>
http://humanum.arts.cuhk.edu.hk/Lexis/C ... d/tai3.wav
Manually making the change in URL shows that it does indeed work.
Please update your engine to create proper links.
Regards.