GR Louis Dowdeswell Trumpet MouthpieceGR Louis Dowdeswell Trumpet Mouthpiece T1. 0 The original mouthpiece made at GR's workshop. Louis' go to mouthpiece for everyday work, great for a commercial sound and easy to play in all registers. T2. 0 A more voluminous version of the T. 1. 0, designed to make a darker sound but without sacrificing too much range and endurance. This mouthpiece is a great crossover mouthpiece, particularly for those that like a relatively narrow rim diameter. T3. 0