For Windows XP, normal operation may not be guaranteed because Microsoft has ended support for this operating system. (Reference)

To record system audio with oCam, it is important to enable the Stereo Mix feature in the Windows sound settings. This allows you to effectively capture the sound being played on your computer. Below is a detailed explanation of how to set up Stereo Mix to record system audio.

First, open the Windows Control Panel and double-click the 'Sounds and Audio Devices' icon. You can do this by opening Control Panel from the Start menu.

The 'Volume Control' window will then appear. In this window, click 'Options' on the top menu and then select 'Properties'. When the Properties window opens, select the 'Recording' option, and in the 'Show the following volume controls' section at the bottom, check the 'Stereo Mix' item. Then click the 'OK' button to save the setting.

After completing the setup, the 'Stereo Mix' item will appear in the Volume Control window. Check the 'Select' checkbox for this item and raise the volume slider to the maximum, and the sound played on the computer will be captured together when recording with oCam. With this setting, you can record game audio, music, or other system sounds.

However, Stereo Mix may appear under a different name depending on your computer's sound driver or system settings. Below is a list of device names that perform the same function as Stereo Mix. If one of the items below appears on your computer, select that device and configure it in the same way:  

- Stereo Mixer (Stereo Mixer)  

- Mixed Output (Mixed Output)  

- Stereo Mix (Stereo Mix)  

- Mixed Out (Mixed Out)  

- Stereo Output (Stereo Output)  

- What U Hear (What U Hear)  

- Stereo Out (Stereo Out)  

- Loop Back (Loop Back)  

- Digital Mixer (Digital Mixer)  

- Post-Mix (Post-Mix)  

- Digital Mix (Digital Mix)  

- Sum (Sum)  

- Wave Out Mix (Wave Out Mix)  

- Wave Output Mix  

- Wave / MP3 (Wave Output Mix)

After following the steps above to enable Stereo Mix and adjust the volume appropriately, set oCam to record system audio and you will be able to record the sound you want clearly. If the Stereo Mix item does not appear, it is recommended to check whether your sound driver is up to date or install the latest driver from the manufacturer's website.