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OS: Ubuntu 12.04 installed with virtualbox on Windows 7 Headset: Mic plantronics audio 400 DSP

Issues: I cannot use the MIC but I can hear sound from the headset without problems.

Here is the sound settings:

selected Output: LFE on Separate Mono Ouput/Amplifier Buit-in Audio

Input options: Vido built-in audio analog input built-in audio line in built-in audio microphone/microphone 2 built-in audio microphone/microphone 1 built-in audio

I have tried all settings under the Sound/Input, still cannot use MIC to record voice through sound recorder. Also I have tried to restart the system with the headset plugged-in.

I assume that I should select "plantornics USB" under the input, but I don't have such an option.

Any suggestion is appreciated.

Thank you

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