Yamaha employs special computer-controlled annealing equipment to ensure that the end result of this heating and cooling process is a consistently superior sound. Hand-lapping pistons and slides ensures an absolutely perfect fit and seal between the pistons and casing or slide parts. Such a perfect fit helps to achieve smooth air flow and smooth action and improve the response and intonation of the instrument. New mouthpiece receiver length enhances the responsiveness of the instrument. New valve stems, buttons, and caps add to the feel of the horn as well as give the horn a sharper overall look.