How to Record Audio When Using a USB Audio Interface
This explains how to record audio that is played through a separately purchased USB audio device instead of through the built-in sound card.
For example, if the USB audio device you purchased is a Scarlett 2i2 USB,
click Sound in Control Panel.
When you click it, the window below will appear, and you will see the newly connected USB audio device in the Playback tab.
Select the USB audio device and click "Set Default".
You can then see that it has been set as the default device, as shown below.
Audio played by the system will now be output through that device, and when recording with oCam, the sound coming through that device will be recorded.
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What to Do If Sound Is Muffled or Too Quiet During Recording (Windows XP)
For Windows XP, normal operation may not be guaranteed because Microsoft has ended support for this operating system. (Reference)
Double-click the Sounds and Audio Devices icon in Control Panel.
The Volume Control window will appear. Click Options, then Properties.
Select Recording, then under Show the following volume controls, check "Stereo Mix" and click OK.
If the sound is muffled, lower the Stereo Mix volume. If the sound is too quiet, increase the Stereo Mix volume.
Since Stereo Mix is a feature provided by the sound driver, on some sound drivers the sound may still be quiet even if the Stereo Mix volume is increased. In that case, you should also increase the system volume.