[ubuntu] Cannot slow down volume in Rythmbox

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http://ubuntuforums.org – I play my music in mp3 in Rythmbox, but when i try to control the volume nothing happens. The volume is very loud, i have to adjust volume directly from the speaker. However, when i play mp3 or video from VLC player i am able to control the volume from the player. Please help. Regards, Naushad Khan (Hardware)