mono/MonoGame — pull request #2890 by tomspilman (2014-08-06 02:10:47+00:00)
Title: XAct Volume Improvements

This PR fixes the XAct volume implementation.

- XAct sounds are no longer affected by `SoundEffect.MasterVolume`.
- XAct sounds can have a volume greater than 1.0.
- XAct sounds better obey the `AudioCategory.Volume`.

To do this I had to remove support for XAudio2 using the mastering voice to set the `SoundEffect.MasterVolume`. Instead it works like all the other platforms and updates the volume on each `SoundEffectInstance` when the `SoundEffect.MasterVolume` changes.