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I am using ubuntu 11.04 and whenever I am using headphone for music but the voice is echoing. But with simple system speaker it is good .Don't know why it is showing error like this.Please help me to solve this.Any help will be appreciable

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That echo could come from your microphone in your headset. You need to mute the microphone sound.

Open a terminal and run the alsamixer program. Use arrow left/right keys to move between sliders and press M for (un)muting a slider. Press Esc when done and run exit to close the terminal.

Alsamixer window

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