AudioSeverity
typedef Boolean (*AudioErrfunc)(const Audio*, AudioError, AudioSeverity,
AudioSeverity sev = Error, // error severity
AudioSeverity sev = Message) const; // error severity
Boolean AudioStderrMsg(const Audio *, AudioError, AudioSeverity, const char *);
AudioSeverity sev) const // error severity
AudioSeverity sev, // error severity
AudioSeverity sev, // error severity