Sony USER GUIDE V G N - C S 2 0 0 - Manual (Page 175)

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Troubleshooting
How do I change the sound output device?
If you do not hear sound from the device connected to a port, such as the USB port, HDMI output port, optical output port, or
headphones jack, you need to change the device for sound output.
1 Close all open programs.
2 Click Start and Control Panel.
3 Click Hardware and Sound.
4 Click Manage audio devices under Sound.
5 On the Playback tab, select the desired device for sound output and click Set Default.
Why do sound interruptions and/or dropped frames occur when I play high-definition
videos, such as those recorded with the AVCHD digital video camcorder?
Playing high-definition videos requires substantial hardware resources, such as CPU, GPU, or system memory performance
on your computer. During the video playback, some operations and/or functions may become unavailable, and sound
interruptions, dropped frames, and playback failure may occur depending on your hardware specifications.