What software can you use to record both the internal and

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The free Audacity recording program will do what you want. But you will need to have the "Stereo Mix" (could be called "System Mixer", and in the case of SoundBlaster its "What You Hear") and have it set as the Default Recording Device. With the Stereo Mix, any audio input, e.g. microphone, line in, system sounds, audio from the internet, etc will be available to record.

Audacity: Audacity: Free Audio Editor and Recorder

Actually this kind of recording programs are a lot through the web. But those utilities are always diffifcult to operation or will cost some fees. My friends recommended a Free Online Audio Recorder to me. It is freeware and can record both system sound and microphone together. That help me most when I record my customized music.

Note: If you want to record "both the internal sounds (hearable in earphones) and the external sounds (my voice) at the same time", you need to select "system sound and microphone" in audio input.

As Audacity is free, can't get any cheaper than that.

Sorry, but your post sounds like a SPAM post advertisement for recording program, especially considering you recently joined the forum and posting to an old thread.