Elgato Game Capture HD can be used to capture the output of many Windows PCs, via HDMI.
The following instructions will help you make sure that the audio from your PC can be picked up both by Elgato Game Capture HD, and your PC's speakers.
Windows 7 or Windows 8 Setup
1) Open the Control Panel
2) Select Sound
3) Choose the Playback tab
4) Highlight your Speakers
5) Choose Set Default
8) Look for a recording device named Stereo Mix or Mono Mix
10) Highlight this new device
11) Choose Set Default
12) Double click on your Stereo Mix or Mono Mix device
13) Choose the Listen tab
14) Check Listen to this device
15) Choose the HDMI Output from the drop down menu.
16) Click the Apply button
17) Click the OK button
Other Solutions for Audio Sharing
There are a few other solutions for sharing audio between applications in Windows.
Jack can connect a number of different applications to an audio device, as well as allowing them to share audio between themselves.
http://jackaudio.org/
Virtual Audio Cable software allows you to transfer audio (wave) streams between applications and/or devices.
http://software.muzychenko.net/eng/vac.htm
Voicemeeter Virtual Audio Mixer
http://vb-audio.pagesperso-orange.fr/Voicemeeter/
The following instructions will help you make sure that the audio from your PC can be picked up both by Elgato Game Capture HD, and your PC's speakers.
Windows 7 or Windows 8 Setup
1) Open the Control Panel
2) Select Sound
3) Choose the Playback tab
4) Highlight your Speakers
5) Choose Set Default
6) Choose the Recording tab
7) Right click, and then select Show Disabled Devices
7) Right click, and then select Show Disabled Devices
8) Look for a recording device named Stereo Mix or Mono Mix
9) Right click on the Stereo Mix or Mono Mix device, and choose Enable
10) Highlight this new device
11) Choose Set Default
12) Double click on your Stereo Mix or Mono Mix device
13) Choose the Listen tab
14) Check Listen to this device
15) Choose the HDMI Output from the drop down menu.
16) Click the Apply button
17) Click the OK button
Other Solutions for Audio Sharing
There are a few other solutions for sharing audio between applications in Windows.
Jack can connect a number of different applications to an audio device, as well as allowing them to share audio between themselves.
http://jackaudio.org/
Virtual Audio Cable software allows you to transfer audio (wave) streams between applications and/or devices.
http://software.muzychenko.net/eng/vac.htm
Voicemeeter Virtual Audio Mixer
http://vb-audio.pagesperso-orange.fr/Voicemeeter/