10.6

Table Of Contents
1050Logic Pro User Guide
Auto-erase Duplicates” checkbox: With this selected, playing or adding a note to a
MIDI region, either through step recording or merging, at the same position, pitch, and
MIDI channel as an existing note, deletes the previous note. For the purposes of this
function, the same position is defined as two notes with the same quantized playback
position if both notes have been quantized, or within 100 ticks if quantization is not
being used.
Tuning description and settings
Overview of tuning in Logic Pro
Tuning settings are available only when Show Advanced Tools is selected in Advanced
preferences.
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, look 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.
The following table provides a summary of the various calculations.
Note Frequency (Hz) Notes
C 100 x 1.5 divided by 2.
C# 106.7871 Divide by 2 to stay in octave.
D 112.5 Divide by 2 to stay in octave.
D# 120.1355 Divide by 2 to stay in octave.
E 126.5625 Divide by 2 to stay in octave.
F (E#) 135.1524
F# 142.3828 Divide by 2 to stay in octave.
G 150 x 1.5 divided by 2.
G# 160.1807
A 168.75
A# 180.2032
B 189.8438
C 202.7287