downmix wave file from stereo to mono

[Zhang Weiwu]

   Zhang Weiwu wrote: > Today I got a simple job to convert a 600MB
   stereo .wav file to mono .wav file. Very simple task. Oh god. Now I
   installed audacity. What the hell, I don't find a menuitem/settings
   dialogue box to let me downmix it. Should I finish learning a whole
   sound editor before I can do simple work like downmixing a wave file?
   OMG someone help me out.
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