For over twenty years, TrumCor has paved the way for quality and innovation as the premiere mute-maker for the world's finest brass players. Renowned soloists and players from the world's greatest orchestras across the globe use TrumCor mutes. Their mutes are a continuation of a fine tradition in mutes for brass instruments first developed by Frank DePolis. DePolis mutes were used by Ted Griffith as models for his eminently successful line of Ted Griffith Mutes. Later, William Cook and Walter Lawson made further improvements with Aulos Mutes, which TrumCor purchased in 1994.