Sheldonbrown.com technical writer and editor John Allen frequently shoots video from his bicycle using more than one camera; sometimes a separate audio recorder. The output must be synchronized in post production. John has now performed a major update on his article about how to keep the recordings in sync, going so far as creating true surround sound without a surround recorder.
![](http://cdn-0.sheldonbrown.com/blog/wp-content/uploads/2020/03/handclap-still.jpg)
Hand clap to synchronize video and audio
![Change speed dialog box in the Audacity audio editor.](http://cdn-0.sheldonbrown.com/blog/wp-content/uploads/2020/03/audiospeed.png)
Change Speed dialog box in the Audacity audio editor.