In OpenShot, you can delete the audio of your video and replace it with another one. You can right click on the video click and select separate video. Or you can click the video and let the audio mute. There is option to fade in and fade out for the audio. If audio is longer than your clip, you can use the scissor tool to cut the audio as the video ends.
Check out basic OpenShot tutorial or list of OpenShot tutorial.
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