Margann
like you, my focus is more on the images in an AV, but the music is also pretty important too, and so is the synchronisation. I’m not knowledgeable on what your trying to do or what your experiences are. I have been involved with AV since around 1980 which slide tape, so I do have some experience. Synchronising images to music is easy, far easier than some perceive. From one enthusiast to another, don’t hand the synchronisation of your images to music to a machine.
You can add images on the fly easily. Take a look here