Ability to disable/remove audio channels for preview and export

[ariasuni]

The fewer issues I have to read, the more new features I will have time to implement, so I ask that you please try these things first

• Check out all the menus and keyboard shortcuts. Maybe the feature already exists?
• Try with the newest version from GitHub
• Read the documentation and FAQ, Known issues, Troubleshooting to see if the feature already exists
• See if someone already suggested this under Issues or Discussions

Description

Thanks a lot for LosslessCut! It would be useful to be able to disable/remove audio channels for preview and export, in my case mostly to extract a background audio or a voice from a video file with 6 channels (5.1 audio) for example.