MainStage 2 is a music program developed by Apple that is optimized for live performances. You can use this utility to create custom sounds, record performances, use audio effects with sound input through a microphone, and much more. Course for MainStage 2 - QuickLook Guide is a Mac application that helps you use the aforementioned music tool.
The app gives you access to 10 quality video tutorials presented by Darren Burgos, a live performance expert. By watching these clips, you will learn how to add and map screen controls, learn the reasons why it's better to use an audio interface, and much more.
This program enables you to play the videos in full-screen or windowed mode, lets you fast-forward clips, gives you access to the latest news regarding the apps used for producing music.
However, on the developer's homepage you will find the same video tutorials that you can watch by using your default browser. Hence, installing a third-party app on your Mac to play these clips is not absolutely necessary.
Anyway, cutting a long story short, Course for MainStage 2 - QuickLook Guide is a simple and helpful Mac application that comes in handy to users who wish to learn the basics about MainStage 2. And since it comes without a price tag, I can't find any reasons why you shouldn't try it.