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Control the audio channel / track by directshow?

hi,
i have write(using vb.net) a small karaoke system which
can play .mpeg, .AVI, .VOB 1 format video file by using
directshow. but currently i'm facing a problem which i cant
control the audio channel / track in the music video. Is
that any methods or ways to allow me to control the audio
channel (play only backing music or vocal or both) by using
directshow (in vb.net). Please help!
Sep 18 '10 #1
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