First, you can mute the video clip you currently have. Here is an OpenShot tutorial on how to add music to your videos.

You can add any track of music of narration to your videos using OpenShot. You can also click the razor tool at the Edit Toolbar to trim the video clip at the moment of your time lapse indicator is in that moment. You might as well resize the edge of the timeline of the clip if you click and drag the edge of it. You can crop the video clip by deleting one of the portions of the video clip or keep both parts. You will see the option to 'Slice' the video clip. Once you place your time indicator at the right moment, left click on the upper part of this indicator. Now, place the time player indicator right where you would like to trim or crop your video. You will see the duration of the actual video clip. Here is an OpenShot tutorial to trim a video: To do so, place the video clip on the timeline. You can adjust the duration of each video clip you use on your videos. To import a EDL to edit it with OpenShot, on the 'File' tab click on the Import Files option and search for the desired EDL. Among all the options that will unfold, you need to click on 'Save project' to save your EDL and use it with another tool. To export your project from OpenShot, click on the 'File' tab. This works the other way around too you can save a project on another editor and keep working with it on OpenShot. That means that at any moment you can save your OpenShot project and keep editing your video using another editor. OpenShot has the useful feature that it is compatible with the project or EDL (Edit Decision List) of a wide variety of other video editors programs (Adobe Premier, Final Cut Pro, among other editors). You only need to double click it and the application will be installed quickly and shortly after will be available to use. The installation process is rather simple, since all the versions include an executable. There are different versions for each respecting operating system. If you want to install the latest version of OpenShot, then you need to download it from the OpenShot official website.

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Open shot editor tutorial