Game Volume Wont Play Through Headset

[Falconium]

I just got Steam and Dungeon Defenders, but whenever they are running my sound is messed up. Before, all game volume and voice chat would go through the headset, but now any background volume will play through my speakers. How do I change this? If I go into control panel, and while on my headset, select 'Set as Default Device' nothing will happen and it shows as Default Communication Device.

Please help, this is really frustrating. When I had Dungeon Defenders on GameSpot's client this problem never occurred. Is there a way to set the default game volume device in the Steam or Dungeon Defender's client?

EDIT:Windows 7 PC

[Ice]

I just got Steam and Dungeon Defenders, but whenever they are running my sound is messed up. Before, all game volume and voice chat would go through the headset, but now any background volume will play through my speakers. How do I change this? If I go into control panel, and while on my headset, select 'Set as Default Device' nothing will happen and it shows as Default Communication Device.

Please help, this is really frustrating. When I had Dungeon Defenders on GameSpot's client this problem never occurred. Is there a way to set the default game volume device in the Steam or Dungeon Defender's client?

EDIT:Windows 7 PC

Dungeon Defenders will use the default Windows sound device. If you're using Windows 7, Windows can attach different output devices to the program you are using. So when you launch Dungeon Defenders, Windows will see this and force the audio out the speakers. You can notice this happening if you open up the sound mixer in the taskbar and then launch Dungeon Defenders. You'll have two devices that you can switch between (speakers/headset) and Dungeon Defenders will likely be sitting there under the speakers area. Audio control panels that come with your sound card can also play havoc with this as well.

Your solution will be to configure your Windows mixer to move Dungeon Defenders to the headset or if you have an audio control panel(like realtek audio manager) merge the speakers/headset outputs together. In the merge method sound will go out both devices all the time which is quite helpful if you're a person that's constantly switching between the two(hehe my setup).