UnderTone Audio (UTA) is a boutique pro audio manufacturer founded by producer and engineer Eric Valentine, known for high-end analog recording equipment that combines classic character with modern flexibility. Products such as the MPDI-4 Mic Preamp, UTEQ Equalizer, and UnFairchild 670M II are designed to deliver rich harmonics, high headroom, and precise control. Built for professional recording, mixing, and mastering, UTA gear is trusted by engineers and producers seeking distinctive analog tone with modern workflow.