You can record any sound from your computer soundcard playing. Just do the following steps:
1. Run Winamp or other media player to play audio files.
2. Click Device button to select recording device and set input source to Stereo mix.
3. Adjust Recorder Volume and make sure the volume slider is at least in half way.

4. Click Record button or click Record->Start to Record menu item and try your recording, you will see the volume meters display of the recorded audio. Click Stop to end recording.
5. To listen to your recording, just select the recording file name from the recording list, click Play button or click Record->Play menu item for playback.
6. You can click output audio format settings button to save the recording as audio file such as mp3, wave, wma, ogg. you can also adjust the output audio file's channel, sample rate and bit rate information by click Settings menu items.