All of our current logos are posted at Unreal Engine Branding-Richtlinien und Verwendung von Markenzeichen - Unreal Engine. At the moment, the animated logo is a simple fade-in, fade-out, with no sound. We are updating the animated logo to include sound, and we expect to release that soon, but we can’t guarantee a date just yet. You are welcome to add sound to the current logo. Please be sure to complete the trademark license agreement at the branding link above and send it to Epic legal (email address is included in the form). Thanks and best of luck with your project.