PRAELUDIUM III - PRAELUDIUM IV/E - User's Manual
SECTION VOICING
AHLBORN Classical Organs
English Page 21
The intermediate 0 position corresponds to the total absence of acoustic undulations.
Negative values FLATTEN the sound, and positive values SHARPEN the sound.
Case I light undulation
Case II strong undulation
Case III very strong undulation
It is advisable to establish larger differences for the low stops (16' - 8') and smaller differences for the higher
stops (4' - 2' Mutations-Mixtures), as the undulation effect turns out to be very marked with the latter. Given
the complex and delicate nature of this variation, the organist can avoid extreme and unnatural solutions,
by following his/her musical awareness. This control regulates also the speed of the acoustic undulation of
the organ' s undulating stops (as Unda maris/Vox coelestis, etc.).
Example:
4
PITCH ADJUSTMENT
•RECIPROCAL TUNING RELATIONSHIP BETWEEN SEVERAL STOPS.
With this control, it is possible to create various acoustic undulations between stops in order to avoid an
unnatural sound inactivity of the ensemble. This regulation should be carried out by inserting TWO OR
MORE STOPS (even on different sections with Couplers), one of which will be the object of the regulation
with respect to the others.
VALUE RANGE from - 63 to + 63
Stops I case II case III case
Principal 8' +26 +32 +37
Flute 8' +13 -10 -18
diff.
13 42 55
IMPORTANT REMINDER
The PITCH ADJUSTMENT control is strictly related to the value assigned to the ENSEMBLE control (see description
in page 38 ). It is recommended to regulate it at a medium level (2 or 3) before starting the current adjustment.
4
TONE CONTROL
With this control, it is possible to reduce (filter) the high frecuency portion of each stop.
VALUE RANGE from 0 (maximum filtering) to 20 (absent filtering)
