Sony VGN-TXN27N - Manual (Page 33)

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Using Your VAIO Computer
Disc drive eject button
Ejects the optical disc drive tray.
If this button does not work, try the substitute drive eject button on the optical disc drive.
Muting button Turns the speaker and microphone volume on and off.
Volume buttons
(Volume up and Volume down) Increase and decrease the volume.
Special-function button Functions