I'd like to confirm if D3E spec uses IE9's key name or not.
D3E spec defines "AudioMute", "AudioVolumeDown" and "AudioVolumeUp".
However, IE9 users "VolumeMute", "VolumeDown" and "VolumeUp".
D3E spec defines other "Audio" prefixed key names. So, it may make sense to add "Audio" prefix for all of them. However, it sounds like a little bit redundant for me. I mean, "Volume" prefixed keys sounds like audio related for me.
For compatibility with IE9, it's better to change D3E spec's key names, but I'm not sure which is better way for these keys.
The VolumeMute, VolumeDown, and VolumeUp make sense for alignment. I tried standardizing on Volume for the other key names, but it just didn't seem right, for example:
VolumeBassBoostUp just didn't seem as descriptively accurate as AudioBassBoostUp (because the subject is the "bass boost" not the Up, and volume bass boost doesn't make sense to me.
Fixed in the latest version of the spec: r240