It's easy to do it using this Streaming Audio Recorder, it can record any voice of computer and microphone. Also, you can capture desktop activities, create video tutorials, presentations and record game process with ease. And the recorded file is very good. You can try it for free, just download the free trial version.
http://www.icoolsoft.com/guides/how-to-record-streaming-audio.html
Streaming Audio Recorder
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