To record video with sound, you will need to
- connect a microphone to your sound card,
- enable audio capture in Creative WebCam Center.
How to activate the Audio recording option in Creative WebCam Center:
- Launch Creative WebCam Center, and click Capture button.
- Select Tools, and click Settings.
- Click on Capture, and change the folder name if needed.
- Click on Video Capture to select it, and check the box next to include audio in the AVI Options group.
See creative.com for more.