Apple Logic Pro 9 - Manual (Page 1226)

• User: Root Key pop-up menu: Allows you to choose a global key (C-B) for the chosen
scale. This provides an easy way to reference the chosen scale to any root note.
• Hermode Tuning: Type pop-up menu: Allows you to set different Hermode Tuning modes.
• Classic (3/5-all): This mode provides a broad and regular tuning of pure 5ths and
3rds. In cases of conflict, the degree of purity is temporarily reduced. This mode can
be used for all types of music. The value of the Depth parameter indicates the degree
of the 5th and 3rd purity. A setting of 100% determines maximum purity. A 10%
value is the lowest purity setting. Off sets the tuning to an equal tempered scale.
• Pop/Jazz (3/5/7-all): 5ths, 3rds, and 7ths are changed in this mode. It is great for Pop
and Jazz styles, especially when using sustained chords. It is less suitable for
polyphonic music, as the detuning of the natural 7th is significant. This mode should
always be used with a Depth of 90% or 100%, as other values will render the natural
7th acoustically ineffective.
• Baroque (3/5-adaptive): This mode tunes pure 5ths and 3rds (with changing
characteristics). In tonal music, with a clear harmonic center, the middle chords are
tuned very purely, whereas more distant chords are tuned with less purity. If the
harmonic center becomes unclear, all chords are tuned with equal purity. As with
the other mode parameters, a Depth value of 100% determines the highest purity,
and a value of 10%, the lowest purity.
• Hermode Tuning: Depth slider: Allows you to set degrees of effect between 0% and
100%.
About Tuning
The following sections provide some background information about tuning.
About Alternate Tunings
The 12 tone scale used in Western music is a development that took centuries. Hidden
in between those 12 notes are a number of other microtones—different frequency
intervals between tones.
To explain, by looking at the harmonic series: Imagine that you have a starting (or
fundamental) frequency of 100 Hz (100 vibrations per second). The first harmonic is double
that, or 200 Hz. The second harmonic is found at 300 Hz, the third at 400 Hz, and so on.
Musically speaking, when the frequency doubles, pitch increases by exactly one octave
(in the 12 tone system). The second harmonic (300 Hz) is exactly one octave—and a pure
fifth—higher than the fundamental frequency (100 Hz).
From this, you could assume that tuning an instrument so that each fifth is pure would
be the way to go. In doing so, you would expect a perfectly tuned scale, as you worked
your way from C through to the C above or below.
1226 Chapter 43 Project Settings in Logic Pro