If the volume is lower than normal on your Sony Vaio laptop computer, this means that one or more of the channels on your sound card has had the volume reduced or has been muted altogether. There are many different channels on your sound card aside from standard “Volume,” and they each will affect the overall sound level on your computer. You can fix these volume issues on your Sony Vaio through the Audio Control Panel. Writer Bio

How do I Fix Low Volume on a Sony Vaio   3 Steps  - 1