Back in SH3 I used the sound mod "Das Boot". There was a CTD ever when the "New Message received" was played. Thought there was a patch available which solved the problem.
All I know (I think to know) is:
1. the right format must be used (mono/stereo/joint stereo)
2. the samplerate must be within some limits
3. the filesize must not exceed the maximum allowed size
I could be wrong with these infos, but this are the points where I'd begin to test with.
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