Volume/Mute Not Supported Is Displayed Instead Of The Appropriate Mixer Controls
The Not Supported message is displayed when it is reported by the sound card driver that either Volume or Mute/Select adjustment is not possible on a specific mixer. Sound Control displays all mixers where either Volume or Mute/Select can be adjusted. If a mixer reports that both Volume and Mute is not supported it is hidden.
If the mixer you require displays a Not Supported message look down the listed mixers to find a possible alternative. On occasions you may find a mixer may display Not Supported but further down the available list you find the mixer you require with Volume and Mute adjustment enabled.