I am a self-confessed Dumbo with Opus and the last time used the Command Editor (with help from this forum) was a simple renumber of audiobook files.
I can't remember how to open the editor to add code (script?) to do this function.
I have the music tracks on an MP3 stick (D) but as I can't access the gubbins of Opus to try the code you kindly sent me,, I'm no nearer than I was yesterday.