Key B Organ viscount Legend Mode D'emploi page 53

by an electromechanical organ with only one drawbar pulled out. The frequency of the sound generated by a
pipe is directly proportional to its length: the longer the pipe, the lower the frequency. The pipe producing the
root note is 8' long; shortening the length of one half, to 4', the note is an octave higher, while with a double
lenght of 16', the generated note is one octave lower.
Drawbars work the same way, and it is possible to note how the size, expressed in feet, decreases from left to
right, as in a graphic equalizer, where the frequency increases as one moves from left to right. The use of
drawbars can be compared to that of faders in a graphic equalizer: faders modify the timbre of the input
sound, just as drawbars in an electromechanical organ define the timbre by controlling the harmonics.
Drawbars on the left control the lowest harmonics, while those on the right control increasingly higher notes.
The only drawbar that does not follow this rule, as described below, is the second from the left
The level of the harmonic increases as the drawbar is pulled out, and the exact level is shown by the numbers
printed on the bars; the level is decreased by pushing the drawbar in.
HARMONIC
SERIE
PIPE
INTONATION
SCALE
PITCH
CORRESPONDING
NOTE
To know the relationship between the sound generated by various drawbars it is necessary to divide the size in
feet of a given drawbar for the size of the first drawbar to the left (that generates the same sound of a 16' pipe).
The white drawbars are those whose relationship with 16' is a power of 2 (2, 4, 8 and 16), this means that these
drawbars have intervals of one or more octaves among them. The octave interval is considered the "purest",
and the white color indicates this interval. Registers that have intervals different from the octave are marked by
the black color. An exception is made for the first two drawbars, as the first is not white even though it has an
interval of an octave, while the second seems to violate the harmonic scale (from low to high). These drawbars
are brown in color, as they are sub-harmonics of the 8' register, which is traditionally considered the root note.
Making an other comparison with an equalizer, drawbars can be used to generate sound according to
frequency; the first two drawbars on the left (16' and 5 1/3') control bass, the central group of four drawbars
(8', 4', 2 2/3 'and 2') define the main sound and the last three drawbars (1 3/5', 1 1/3' and 1') adjust the sound
brightness.
As in the most famous electromechanical organs, Legend, Legend Classic and Legend Live feature 38
drawbars, divided into five groups, called Sets. First two groups on the left, called UPPER A and UPPER B, are
the drawbars dedicated to the upper manual. The two sets on the right, LOWER A and LOWER B, are the
drawbars of the lower manual. The central group is made up of the two pedalboard drawbars.
Set A of the
upper manual
To use the drawbars of Set A, press the key A# of the Black Octave for each manual (Legend and Legend
Classic) or the button [DRAWBARS SET A] (Legend Live). To use the drawbars of Set B, press the key B of
16' 5-1/3' 8' 4'
SUB-
5th
UNISON OCTAVE
OCTAVE
C2 G3 C3 C4
Pedalboard
Set B of the
Drawbars
upper manual
EN - 17
2-2/3' 2' 1-3/5' 1-1/3'
12th 15th 17th 19th
G4 C5 E5 G5
Set A of the Set B of the
lower manual lower manual
User Manual
1'
22th
C6