[ubuntu] Mic plantronics audio 400 DSP doesn't work on ubuntu 12.04

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http://ubuntuforums.org – Hello all, 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 (Hardware)