

If Messenger is running and you make the change it will continue to use the speakers until you do so. Note that it is necessary to restart Messenger for these changes to take effect.

The audio will now go through your headphones This will cause all communication audio (ie - Live Messenger calls) to redirect through the headphones when they are connected

If you make a video call or voice call through messenger it will direct to the default communications device not the default playback device. Turns out that messenger falls into the second category.

(the default value), 1 for Multimedia, and 2 for Communications.Discovered something else totally cool about Windows 7 (and probably Vista though i havnt tried it on there). Setdefaultsounddevice parameter is optional and may countain one of the following values: 0 for Console NirCmd Command Reference - setdefaultsounddevice for system sounds, but want communication on their headset, hence there are two separate Playback Device settings, Default Device (for non-communication.
