1) Double click on the mixer icon (yellow speaker) in the System Tray.
2) Select Options | Properties | Playback.
3) In the "Show the following volume controls:" box, make that sure that the
"MPU-401" is checked.
4) Click the OK button. You will now see a new module on the mixer for the
MPU-401.
5) Remove the check from the Mute checkbox and adjust the slider to the
desired volume.
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