I don't know about free, but one product worth its money is audio hijack
pro and I am pretty sure it would do what you want
http://www.rogueamoeba.com/audiohijackpro/
IanW
Michael Wong wrote:
> Dear all,
> I have some movies with nicam (dual voice channels) but there is no voice
> channel selection in iPhone. Is there any free software may delete one of
> voice channels?
>
>
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