This feature allows you to replace the sound of a video file with your own project. After preparing the whole project, if you want to replace one video file's sound with your own project, click the 'Export to Video' button on the 'Mixing' Tab, then the video window will pop-up. Choose the video file you want to use and choose the export file you want MixPad to create. Then click 'Export', MixPad will create a new video file which contains the original video file's video frames and your project's sound. A bookmark is also created that marks the end of the exported audio.