Quick question about sounds, audioSprites and markers

Hi all,
I have a really quick and simple question for you: What is the point of (or what are use cases for) audio sprites (also markers)?

In our game, we have 30-40 sounds, most of them ~1s long. We need to be able to use events, play multiple sounds at once, fade-in, fade-out and so on. I did not find a way to achieve this (mostly events, but also fade-in, fade-out), using audio sprites or markers.
What are the pros and cons of loading multiple audio files and create a separate audio object for each one of them vs using audiosprites?

Thanks!