Using Magix Movie Studio 2023 or Movie Edit Pro or Video Pro, here is how to mix down the audio of a video file to create a wave file to be able to send it to an External Audio Editor from the timeline for cleaning, restoration, mastering.
The feature to send the audio part of a video file to an external audio requires a mixdown to a wave file before the feature becomes available. This can be done simply within the video editor.
0:57 Case 1 - One object on timeline, Audio/Video on separate tracks
2:32 Case 2 - Multiple objects on timeline, Audio/Video on separate tracks
5:20 Case 3 - Multiple objects on timeline, Export to Wave file, Import Wave file