2. Straight Mutes
Straight mutes are probably the most commonly used of all, and are available for trumpet, flugelhorn, cornet, trombone, euphonium, baritone horn, french horn and tuba. The straight mute has a hollow, cone shape that fits inside the bell of the instrument, held in place by pieces of cork which are usually glued to the side of the mute. They tend to produce a brighter, more nasal sound than an unmuted instrument. Most commonly used in classical and brass band music, straight mutes may be made from aluminium, copper, plastic or plaster. Aluminium mutes have a particularly bright, harsh sound and are often used in orchestral music, whereas plaster or plastic mutes tend to sound slightly warmer and are favoured by big-band players. Its worth noting that metal straight mutes produce slightly better intonation than their non-metallic counterparts.
picture on left side: Jo-Ral Trumpet Straight Mute
Picture on right side: Humes & Berg Trombone Straight Mute
Trumpet sound without mute
Trumpet sound with Straigt Mute