Operation, Drawbars, Operation / drawbars – Studiologic Numa Organ User Manual
Page 10
NUMA Organ by Studiologic®
10
Operation / Drawbars
Drawbars are a characteristic trait of a tone wheel organ.
Therefore we’ll explore them fi rst.
In the text the drawbars of the NUMA Organ are indicated by
coloured highlighted digits as shown below.
You use the drawbars to set the timbre of the NUMA Organ. A sound
can comprise up to nine sine frequencies.
Each drawbar represents a harmonic of the harmonic scale related
to the 8‘ stop of a pipe organ or respectively the drawbar
3
, which
is also called “native pitch“.
Drawbar
1
2
3
4
5
6
7
8
9
Feet
16‘
5
1/3
‘
8‘
4‘
2
2/3
‘
2‘
1
3/5
‘ 1
1/3
‘
1‘
Harmonic
related to 8‘
-
-
1.
2.
3.
4.
5.
6.
8.
Harmonic
related to 16‘
1.
3.
-
-
-
-
-
-
-
Note: The labelling of the drawbars in feet derives from pipe organs, where
it represents the length of the pipes. For the 8‘ stop of a pipe organ the
pipe of the note C is exactly 8 feet long (=2,4m). The pitch is correct to the
key, based on the keys of a piano. Therefore the 8‘ stop is also called native
pitch or unison stop.
The colouring of the drawbars is very intuituive:
Brown drawbars add frequencies below the native pitch.They are
also used to adjust the timbre for Pedal. White drawbars are related
in octaves to each other, at which drawbar
3
(native pitch) repre-
sents the fundamental. Finally the black drawbars add fi fths and a
major third to the timbre.
When a drawbar is pushed all the way in (until you can‘t
see any digit), its harmonic is absent from the timbre. The
maximum volume for the drawbar is achieved, when you
see the digit 8. There are seven more volume positions in
between to add the harmonics of each drawbar to the timbre.
• Drawbars
Drawbars
1 2
3
4
5
6
7 8
9
• Upper
• Lower
• Pedal