IMO, this bug is invalid since when volume property is set to 0, it means mute.

    <tp:simple-type name="Volume" type="d">
      <tp:docstring xmlns="http://www.w3.org/1999/xhtml">
        <p>Audio volume level</p>
        <ul>
          <li>0.0 means mute.</li>
          <li>1.0 is a sensible maximum volume level (ex: 0dB).</li>
        </ul>
        <p>
          Note that the volume may be higher than 1.0, although generally
          clients should not attempt to set it above 1.0.
        </p>
      </tp:docstring>
    </tp:simple-type>

The problem is that setting the volume to zero forgets the previous volume. A separate mute property would allow the user to mute the audio, then unmute it again and have it go back to its previous level.

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