If I'm making a slideshow with music I don't always want to sync it to the songs length but if I make my slide transitions say 3 secs to keep it a shorter video, then the music just abruptly cuts off at the end whereas it would be nice for it to fade out.
Am I missing this option somewhere? I'm sure I can't be the only person wanting to make shorter slideshows to music?
In order to produce a well-timed audio track with fading the way you want it, it would be necessary to use other software to create the audio track, complete with timing. Then you would add that complete audio track to your slideshow in Lightroom.