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Monophonic and Polyphonic

Some musical instruments like brass and woodwinds are monophonic, meaning that they produce one musical note at a time. Many percussion and all string instruments are polyphonic, meaning that they are capable of producing two or more notes at a time. For example, guitars, harps, keyboards, mallet percussion, and orchestral string instruments can play multiple notes simultaneously. These groups of notes can be called chords. Although trumpets, clarinets, flutes, trombones, oboes and other brass and woodwinds play single notes, by using a technique known as multiphonics, it's possible, at times, to produce multiple notes by singing, humming, or whistling while playing these instrument. Most synthesizers today are polyphonic, but early synthesizers were monophonic. Typically the lowest note played on the keyboard controlled the pitch. A vocalist is monophonic as well, but vocal ensembles are polyphonic. Some processors and plug-ins have user settings that can optimize the algorithms to adapt to either monophonic or polyphonic material.