On the project that I’m currently working on, I needed to delete a sound file.
Initially I simply moved it to beyond the last frame defined in the Camera Layer.
I could then export the project as a movie and the export used the last frame in the camera layer as the end of export.
I then found I could save the project as a pcl file. On examination I found that it’s a text file.
I then opened in a text editor, notepad and removed the first line in the Sound file definition.
I then loaded the project.pcl file and the sound file had truly been deleted.
I then checked that the movie output worked. When it did I resaved the project in .pclx format.
Finally I checked that it exported correctly.
This has truly been a voyage of discovery!