Another common misconception is tha

Another common misconception is that the three-valve instrument is a baritone and that the four-valve instrument is a euphonium. Euphoniums often have a fourth valve as an alternate fingering for 1&3 split fingering with improved intonation. The fourth valve can also be viewed in the same way as an F trigger on trombone, repitching the instrument to expand the lower range. The fourth valve is less common to nearly nonexistent on baritones, but absence of a fourth valve is not a defining characteristic.