Change Audio Volume from Guest OS

It would be great if the guest audio volume could be changed. Currently, when changing audio volume (device Intel HDA) the resulting audio from the guest stays the same and these messages are logged in the console:
```log
qemu-system: warning: GLib-GObject: g_object_set_is_valid_property: object class 'GstAutoAudioSink' has no property named 'volume'
```

Another approach would be to sync the guest volume with the host device's audio volume.