I have a technical question here...

Why the videos that I upload to YOUTUBE converts the audio portion of the video file

into MONO audio(like this one http://youtube.com/watch?v=j-As2ibcu6c )instead of

STEREO audio (like this one http://www.garageband.com/song?|pe1|S8LTM0LdsaSjZlWxYG0 )

.

 

Is there a way to get stereo audio ?