Sequencer: Audio outside the Editor and Epic's Demo

Why does the Epic’s Sequencer demo (Subway Scene) can play audio tracks outside Play in Editor and I’m not being able to play it in a new empty project, with a simple sequencer shot?

It is already on Epic’s roadmap to include it to play outside the editor, but in the Epic’s Demo this doesn’t seem to be a problem…

I’m currently in the process of learning the tool, and took for granted that audio should be handled outside sequencer… but when I was exploring the Epic’s demo, surprisingly this problem was “solved” and I don’t know what they made different.