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In this tutorial, we will see how to adjust microphone boost for Realtek on-board sound cards under Windows 7.
1. Open the Start menu, type "sound" in the search box, then click Sound in the above list.
2. Open now the Recording tab and double-click your microphone.
3. Open the Levels tab and under Microphone Boost, adjust your microphone boost (in dB).
4. Once you finish your adjustment, click Apply then OK.