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From Wikipedia, the free encyclopedia

In music, a chorus effect (sometimes chorusing, choruser or chorused effect) occurs when individual sounds with approximately the same time, and very similar pitches converge and are perceived as one. While similar sounds coming from multiple sources can occur naturally, as in the case of a choir or string orchestra, it can also be simulated using an electronic effects unit or signal processing device.

When the effect is produced successfully, none of the constituent sounds are perceived as being out of tune. It is characteristic of sounds with a rich, shimmering quality that would be absent if the sound came from a single source. The shimmer occurs because of beating.[citation needed] The effect is more apparent when listening to sounds that sustain for longer periods of time.

The chorus effect is especially easy to hear when listening to a choir or string ensemble. A choir has multiple people singing each part (alto, tenor, etc.). A string ensemble has multiple violinists and possibly multiples of other stringed instruments.

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Transcription

Contents

Chorus effect from acoustic instruments

Although most acoustic instruments cannot produce a chorus effect by themselves, some instruments (particularly, chordophones with multiple courses of strings) can produce it as part of their own design. The effect can make these acoustic instruments sound fuller and louder than by using a single tone generator (b.e.: a single vibrating string or a reed). Some examples:

  • Piano - Each hammer strikes a course of multiple strings tuned to nearly the same pitch (for all notes except the bass notes). Professional piano tuners carefully control the mistuning of each string to add movement without losing clarity. However, in some poorly-cared instruments (like the honky-tonk pianos), the effect is more prominent.
  • Santur (and similar coursed-hammered dulcimers) - As well as on the piano, the player can strike (by using a pair of manual hammers instead) a course of multiple strings tuned to nearly the same pitch. As the instrument is frequently tuned by the musicians themselves (rather than by professional tuners), the chorus effect is more easily heard than on the piano.
  • 12-string guitar, bajo sexto and greek bouzouki - Courses with pairs of strings, tuned in octaves and unisons, create a distinctive complex shimmer. In the 12-string guitar, this effect is often accentuated by the use of open and modal tunings, such as open-G and DADGAD.
  • Colombian tiple, guitarrón chileno and tricordia - Courses of 3 (or more) strings, tuned in octaves and unisons, create a more complex shimmer and a fuller effect.
  • Mandolin, lute and oud - Courses with pairs of identically-tuned strings, as opposed to octaves and unisons on the 12-string guitar.
  • Accordion - two or three reed blocks tuned to nearly the same pitch produce a unique and distinctive sound exclusive to the accordion.
  • Pipe organ - The voix céleste [Fr.] (heavenly voice) is an organ stop consisting of either one or two ranks of pipes slightly out of tune. The term celeste refers to a rank of pipes detuned slightly so as to produce a beating effect when combined with a normally tuned rank. It is also used to refer to a compound stop of two or more ranks in which at the ranks are detuned relative to each other.[1]

However, while the open strings of a standard-tuned guitar (or any single-stringed instrument like ukuleles, banjos, etc.) can't produce any chorus effect, it can also be obtained by the use of alternative tunings (such as the "ostrich tuning" by Lou Reed); by playing chords or fingerings with "redundant" notes (like playing the open high E string and the same "E" note on the 5th fret of the B string); and/or by using extended techniques like bending while playing a note (like playing the 5th fret on the 2nd string and, simultaneously, playing a full-tone bending in the 7th fret on the 3rd string).

Chorus as an electronic effect

Example of a Electro-Harmonix Small Clone chorus pedal
Example of a Electro-Harmonix Small Clone chorus pedal

The chorus effect can be simulated by signal processing equipment. The signal processor may be software running on a computer, software running in a digital effect processor, or an analog effect processor. If the processor is hardware-based, it may be packaged as a pedal, a rack-mount module, a table-top device, built into an instrument amplifier (often an acoustic guitar amplifier or an electric guitar amplifier), or even built into some electronic instruments, such as synthesizers, electronic pianos and Hammond organs.

Regardless of the technology or form factor, the processor achieves the effect by taking an audio signal and mixing it with one or more delayed, pitch-modulated copies of itself. The pitch of the added voices is typically modulated by an LFO, which makes the overall effect similar to that of a flanger, except with longer delays and without feedback. In the case of the synthesizer, the effect can be achieved by using multiple, slightly detuned oscillators for each note, or by passing all the notes played through a separate electronic chorus circuit.

Stereo chorus effect processors produce the same effect, but it is varied between the left and right channels by offsetting the delay or phase of the LFO. The effect is thereby enhanced because sounds are produced from multiple locations in the stereo field. Used on instruments like "clean" (undistorted) electric guitar and keyboards, it can yield very dreamy or ambient sounds. Commercial chorus effect devices often include controls that enable them to be used to also produce delay, reverberation, or other related effects that use similar hardware, rather than exclusively as chorus effects.

In spite of the name, most electronic chorus effects do not accurately emulate the acoustic ensemble effect. Instead, they create a constantly moving electronic shimmer.

Notable electronic chorus devices

Although the electronic chorus effect can be obtained by the multiple ways mentioned above, some devices have adquired a high status among musicians, especially in the "effect pedal" form.

  • Boss CE-1 - Released in 1976, it was one of the first chorus effect pedals commercially available, based on the same circuit from the Roland Jazz Chorus amplifier. It was originally conceived for keyboard and synthesizer players, but guitarists have occupied it as well, like John Frusciante (Red Hot Chili Peppers).
  • Boss CE-2 - A smaller pedal (in the standard Boss enclosure) than the CE-1. it was a popular choice for guitarists during the '80s.
  • Electro-Harmonix Small Clone - Used by Kurt Cobain (Nirvana).
  • TC Electronic Stereo Chorus

Examples

Some examples of the use of "obviously chorused guitar tracks" include Fripp & Eno's "Evensong" (0:37), Nirvana's "Come As You Are" (0:00, clearest at 0:48), Mike Stern's "Swunk" (0:00), and Satellite Party's "Mr. Sunshine" (0:19, right channel).[2]

See also

Sources

  1. ^ Encyclopedia of Organ Stops, Celeste.
  2. ^ Hodgson, Jay (2010). Understanding Records, p.143. ISBN 978-1-4411-5607-5

External links

This page was last edited on 23 February 2019, at 21:44
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