[ubuntu] no sound in banshee media player

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http://ubuntuforums.org – hello, id like to ask help with banshee media player. i can play .mov files but with no sound. i tried using vlc player and it played the movie with sound but it cannot read the entire file. i find it weird because banshee can actually play the entire movie with no error...only that it has no sound. i dont have any other media in my laptop because i have just fresh installed my OS . so i have not tested any other media files aside from .mov files. will be happy to hear from you! im using ubuntu 11.10 .. (Hardware)