User manual

The Organ Section User Manual
10
THE TONEWHEEL MODEL
This model is based on a digital simulation of the classic
mechanical tone wheel organ. This simulation utilizes in-
novative and advanced methods to capture every nuance
of the original sound, for example:
• An extremely accurate digital model of the original
chorus and vibrato scanner.
• Modeling of the individual random contact bounces for
each harmonic.
• Modeling of the unique frequency characteristics of the
built-in pre-amplifier which forms the “body” of the
sound.
• Simulation of the energy stealth on the tone wheels
that results in the typical “compressed” sound.
• Authentic tuning of the tone wheels according to the
original design.
• Extremely fast keyboard response.
• Full polyphony.
The Drawbars
The harmonic intervals for the Tonewheel organ are print-
ed below the drawbars.
For basic drawbar operation, please refer to “The Draw-
bars” on page 9.
Each drawbar represents a partial with a fixed harmonic in-
terval relating to the played note. The illustration below
shows the pitch interval among the nine drawbars when
the key of C3 is played. Note that the SUB3 drawbar actual-
ly lies a 5th above the fundamental harmonic. However, in
most situations it is perceived as sounding below the basic
harmonic.
Percussion
The Percussion effect adds extra attack to the sound by
having a single envelope generator controlling either the
2nd or 3rd harmonic. The envelope “opens up” for a short
moment in the beginning of the sound when you press the
key(s).
The Percussion is a single-triggered non-legato effect. By
“single-triggered” we mean that the percussion is only
present when you hit the keys when no other note is
sounding. In other words, if you play a note or a chord and
then add on more notes without releasing the previously
pressed keys, there will be no percussion effect in the new
notes. You have to release all keys to be able to play new
notes with the percussion effect.
The percussion effect is available to the
UPPER manual, and
is activate and deactivate by pressing the
ON button.
The
SOFT button toggles between Normal and Soft percus-
sion level.
The
FAST button toggles between Slow and Fast decay
times.
The
THIRD button toggles between using the 2nd or 3rd
partial as the source for the percussion effect.
The percussion decay time can be fine-tuned for Fast and
Slow mode individually. Please refer to “The Sound Menu”
on page 16 for details.
Note: With the original instrument, you could not use the
percussion effect and 9th drawbar simultaneously. Howev-
er with Nord C1 Combo Organ you can!
Vibrato
The original vibrato and chorus scanner consists of a
tapped delay line in combination with a rotating scanner.
For the Vibrato effect, phase shift is applied to the signal.
For the Chorus effect, the phase modulated signal is added
to the original signal. Three different types of choruses (C1-
C3) and three different types of vibratos (V1-V3) are availa-
ble. Select one of these types by pressing the
MODE button.
The effect can be activated/deactivated for both manuals
individually by pressing the
VIBRATO/CHORUS button of the
UPPER and LOWER drawbars.
Upper & Lower
Drawbar level
Note On
level
time
Normal level, Slow decay
Normal level, Fast decay
Soft level, Slow decay
Soft level, Fast decay