I recently bought a microphone and because I want to use headphones to prevent echo, I decided to enable the microphone playback. However, the microphone seemed to be very quiet in the playback, so I went to the Realtek HD Sound Manager and turned the boost all the way up to +30.0 dB. After recording using that microphone, however, the audio was really loud. After disabling the boost, the audio was, as I expected, good in the recording, but barely hearable in live playback.