Werckmeister Iii; Wind Pressure Stabilization - Johannus Monarke User Manual

When the sub coupler SWELL-SWELL 16' and the super coupler SWELL-SWELL 4' of the
swell is switched on, and the stop UNISONO OFF is on, pressing a key will produce only
two tones. The tone sounding an octave lower and the tone sounding an octave higher.
(the original tone has been switched off with the stop UNISONO OFF).

Werckmeister III

Normally your instrument has Equal temperament (normal temperament).
By switching on the accessory WERCKMEISTER III (WM), Werckmeister III temperament
is selected.
As soon as this temperament is switched on, the Mean-tone temperament will
automatically be switched off, if it is on.
See also at "Choice of temperament".
On your instrument this accessory may be designed as a stop or as a thumb piston.

Wind pressure stabilization

Stop or thumb piston for switching on or off the wind pressure stabilization.
The wind supply of pipe organs is never ideal. Ideally the wind pressure in the wind chest
would always be constant. Whenever a valve under a pipe is opened (on a pipe organ), the
wind pressure will go down a little for a moment, because the wind chest develops a "leak",
so to speak. Depending on the number of valves that is opened at one time (number of
stops and keys) and the size of the pipes, the variation in wind pressure may be lager or
smaller. These variations in wind pressure influence the pitch of the pipes sounding at that
moment. These changes in pitch may liven up the tone of your instrument, if they are not
too great. Very large changes in pitch, however, will be found annoying. Instruments with
this deficiency are known as "prone to windsag".
With the accessory wind pressure stabilization (WS) this effect can be switched on or off.
Switching off the accessory, deactivates the wind pressure stabilizer. The effect of the wind
pressure variations is then more or less audible, depending on the number of stops, the
kind of stops and the number of keys.
Switching on the accessory, activates the wind pressure stabilizer. This means that no wind
pressure variations will occur.
On your instrument this accessory may be designed as a stop or as a thumb piston.
User's Manual
JOHANNUS JOHANNUS JOHANNUS JOHANNUS
27
Monarke