Saya menemukan ini dari Microsoft:
Multiple audio output is not supported by windows 7. It is by design.
However you can contact the hardware manufacturer for other possibilities.
Thank you and Regards.
Thahaseena M
Microsoft Answers Support Engineer.
Tetapi dengan itu saya juga menemukan solusi ini:
Kabel Audio Virtual
Info Lebih Lanjut Tentang Kabel Audio Virtual
Berikut adalah instruksi untuk melakukan ini:
How to do it:
1) Create one virtual audio cable. Is already created after install,
it is called "Virtual Cable 1". You don't have to modify anything.
2) Run "Audio Repeater (KS)" from Start menu.
3) In the Wave In combo select "Virtual Cable 1".
4) In the Wave Out combo select "Audio Speaker" (depends on computer).
5) Click Start
6) Run SECOND "Audio Repeater (KS) from Start menu.
7) In the Wave In combo select "Virtual Cable 1".
8) In the Wave Out combo select "Audio SPDIF Out" (depends on computer).
9) Click Start
10) Run Windows Media Player, go to menu Tools, Options, Devices,
double click Speakers, select Virtual Audio Cable, click OK 2x.
11) Play audio in the player
12) Enjoy never before possible multiple output audio playback!
13) And yes I fully agree that Microsoft developers are a bunch of morons!
Saya belum melakukan ini dan tidak yakin seberapa baik kerjanya.
Semoga ini membantu!