[1.25.15] Callback in AUDIO_OUTPUT_PLAYBACK mode gives a zero-terminated list of events.
espeak_SetSynthCallback() can be called either before or after espeak_Initialize().
git-svn-id: https://espeak.svn.sourceforge.net/svnroot/espeak/trunk@31 d46cf337-b52f-0410-862d-fd96e6ae7743
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