Studio Recordings, Live Sound & Backline Rental Holtz Sound is a high end audio recording, mixing and mastering facility, integrating vintage analogue equipment and instruments as well as modern digital recording and post production systems. The Holtz Studios are located in Tuntange, right in the middle of Luxembourg's idyllic countryside, giving you peace and tranquility to create, perform and finalize your music. Our dedicated staff of technical engineers would be happy to welcome you no matter what you want to realize. We can adapt to your needs as we have worked on all styles of music, audio recordings, live mixing/recording, commercials, movies and post production.