Syncing music with first slide in Photocrati slideshows

Does anyone know a way to sync the music with the first slide in Photocrati slideshow? (The Photocrati website was no help). Presently the music starts when the page is loaded several seconds ahead of the actual slideshow. I’m not interested that the slides are synced within the show, just that the music starts on the first slide and stops on the last. There is the option of the viewer starting the music manually when the slideshow loads but, really, by the time they figure it out, there’s probably going to be an even bigger gap between when the slides finish and when the music finishes. I’ve had suggestions to make a video of the slides, but this doesn’t work in my situation. It’s a code I’m looking for or another workaround. Any suggestions are greatly appreciated. Sample slideshow URL: https://rickcollinsphotographyonline.com/galleries/wildlife-2/slideshow-2/