User Guide

Auto-Tune UserÕs Manual 41
Automatic Mode Controls
¥ Pelog : This seven-tone Indonesian scale is more interesting than Slendro
and is now the primary scale in Balinese music.
¥ Arabic 1 : This 17 tone scale is the original Arabic scale adopted from the
Pythagorean scale.
¥ Arabic 2 (chromatic) : This twelve-tone scale is the modern version of the
Arabic scale popular in Arabic music today.
Contemporary Tunings:
Equal tempered scales with a large number of tones are typically used to
play common tonal harmony with greater purity of intervals and chords.
The typical approach is to analyze a passage (or less) of music and select
tones from a scale that will best approximate the desired pure intervals.
¥ 19 Tone : This scale has greater purity of minor thirds and major thirds
(and conversely, minor and major sixths) than twelve-tone equal tem-
perament. A disadvantage is that perfect Þfths and narrower than those
found in twelve-tone equal temperament.
¥ 24 Tone : Also know as the quarter tone scale, this scale is used for vari-
ety but has no advantage in terms of ratios that better approximate pure
intervals.
¥ 31 Tone : In addition to intervals that better approximate pure intervals,
this scale also contains good approximations to Indonesian pelog and
slendro scales.
¥ 53 Tone : Related mathematically to the cycle of Þfths, the 53-tone scale
has very pure major and minor thirds, and Þfths and fourths.
¥ Partch : Harry Partch is considered the father of modern microtonality.
This scale was devised by him and used in instrument building and per-
formances.
¥ Carlos Alpha : Wendy Carlos performed extensive computer analysis to
devise a number of equal tempered scales with good approximations for
the primary harmonic intervals and their inversions. This scale is good
at approximating the primary intervals including 7/4. This scale divides
the octave into 15.385 steps forming intervals of 78.0 cents.
¥ Carlos Beta : This scale divides the octave into 18.809 steps forming
intervals of 63.8 cents.