Thanks for the information regarding the zip files, I did not know that but it makes sense.
I have renamed the ORG files with a different extension and using all the stock files now in UX.
Changed SYS.TXT to only have the School Zone warning as I have plenty of Schools around me to test.
However I'm still only getting beeps for the warnings, no WAV sounds. I have my SYS.TXT file below.
Spoiler: sys
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