Sony Vegas Pro 13: How to Unlink Audio From Video

How to unlink audio from video in Sony Vegas Pro 13:

1. Select the clip by clicking on it.
2. Press the U key.
3. The audio and video tracks are now separate.
4. To link the clips back together, select both by holding CTRL while clicking on them, and then press the G key.

Video: https://www.youtube.com/watch?v=lp_YBt_doEQ