Hi, I compiled the hts_engine in MSVC. AUDIO_PLAY_WIN32 is not defined in the source codes, so the waveform cannot be played until synthesized. I added AUDIO_PLAY_WIN32 in my project in order to hear the voice online, but a lot of errors occurs which said MFC needs C++ complier. Has any one encountered the same problem? Or does any one knows a solution? Thanks very much! 2010-07-25 Na Xingyu