No but I looks much nicer with a little fog just like a real laser or light show. You can test the output on a second display but you’ll need a projector for the party. This has worked for some users in the past. Please make sure to plug in a Projector before you launch MusicBeam. Here is a guide how to disable Gatekeeper: HT202491 I only see a grey window (Windows) This is due to Gatekeeper, which forces developers to pay Apple $100 each year. Any Questions? 'MusicBeam' is damaged and can't be opened.
