Koen Heldens is a renowned mixing engineer best known for his work with XXXTentacion, including the No. 1 hit "SAD!" He has also collaborated with artists like Trippie Redd, Ski Mask The Slump God, and Lil Yachty. In a recent interview, Koen discussed his journey into the industry, his creative process, and his experience mixing XXXTentacion’s music, both before and after the artist's passing. He also shared insights on modern mixing techniques and advice for aspiring engineers.