Viscount Cantorum Dou, User Manual

Page: 95 / 166

EN - 39
User Manual
Setting a stop in Local Off mode means that it will not be played by the organ’s internal sound generation
system, but the relative MIDI (System Exclusive code) message will be transmitted, so that it can be
turned on and played on a connected instrument.
To set a stop in Local Off mode, while the main screen is on the display, press the [S] (Set) piston, keep it
pressed and also press the [C] (Cancel) button. The LEDs of all the stops will light up and the display will
show the video page:
To set a voice in Local Off mode, operate its draw-stop or rocker switch so that its light goes out.
After setting the setup required, press [S] and [C] together to save it.
Accessing the Local Off setting function after this will trigger display of the status of the stops as
follows:
-
Light on: stop in Local On mode (plays with internal generation)
-
Light off: stop in Local Off status
10.1 DEMONSTRATION SONGS
The organ has a number of demonstration (demo) tracks to allow you to fully appreciate the quality its
sound qualities and/or those of the changes you have made.
To recall playback of the demo tracks, select the
DEMO field from the menu MAIN MENU.
Use the [FIELD

] and [FIELD

] buttons to select each song of music. Press [ENTER] to start and
stop each song. Press [EXIT] to leave the DEMO function.
10.2 TEMPERAMENT
Tuning a fixed intonation instrument (e.g. organs) consists of creating a chain of twelve fifths, properly
crafted so that at the extremes the interval can be reduced, through division or multiplication, to a perfect
octave. A perfect fifth is achieved when two sounds have a frequency ratio of 3:2. If from any sound we
calculate twelve ascending perfect fifths, the sound obtained is (3/2)
12
. With 7 octaves instead, the result is
a 27 frequency. If we compare these values we find that (3/2)
12
is slightly higher than 2
7
. Rounding off
after the fourth decimal, we find that:
(3/2)
12
=129,7463 , while 2
7
= 128,0000. The ratio between these two value is called Pythagorean comma.
It can be defined as the surplus of twelve perfect fifth compared to seven octaves, both starting from the
same sound.
9. STOP LOCAL OFF
10. APPENDIX