Sony VAIO VGN-P500 - Manual (Page 65)

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Using Peripheral Devices
Connecting the Noise Canceling Headphones
To connect the noise canceling headphones
1 Plug the headphones cable into the headphones jack i.
The icon appears on the taskbar to indicate that the noise canceling function is enabled and a balloon message
pops up from the icon.
✍
When the icon is on the taskbar, the noise canceling function is disabled. Right-click the icon and select Enable Noise Canceling Function from
the menu.
If no icon is on the taskbar, see What to do if the icon and the balloon do not appear (page 67) to change the settings.