Wikipedia
Metasonix
Metasonix is an audio equipment manufacturer based in Lakeport, California. Founded by Eric Barbour in 1998, it specializes in vacuum tube equipment. Metasonix users include Trent Reznor, Robert Rich, U2, Tim Skold, Richard James and Insect Joy.
Eli Crews, writing in Electronic Musician in 2008, wrote that "Eric Barbour of Metasonix has a colorful approach to design, employing an all-tube audio path in his quest for unusual and sonically extreme products."