Virtual blower and bellows

The wind model based on 4 wedge bellows driven by invisible calcants is employed here again (we introduced it in the Zwolle model and built it also into the Forcalquier model).

Four bellows are seen, all feeding one common trunk where all the divisions are fed from. When the bellows are full (Voll), they are attached to the wind trunk of the organ and the air begins to flow from the bellows to the organ. In this way, the bellows are emptied (Leer) after some time and they are filled again by calcants. The indication of the bellows extension is shown. The small icons above this indication are showing the state of the inlet and exhaust valves of the given bellows. The left is inlet, the right is the exhaust valve. These operate automatically, but they are also clickable, so you can detach any bellows at any moment from the wind system of the organ if desired! For this purpose, there is the blue dot below each of the "Balg". By clicking on it, you can disable/enable the given set of bellows (Balg). Besides the moving board indicators, there are also the pressures inside the bellows and inside the windchests indicated. This setting of the bellows imitates the ancient way of the organ wind system construction and adds to the aliveness of the pipe sound due to small instabilities generated in the wind ways when under heavier load. In the left bottom corner, there is the blower switch ("Gebläse") - if you switch it off, the bellows will deflate after a while and the organ will be without wind - i.e. without any sound. Also, you can alternatively choose to bypass the non-return valve (Klappen) present at the foot of each the set of bellows. This can produce different behavior of the wind system if desired. In the right bottom corner, there is the main valve shown in a form of continuous controller. Clicking on the main exhause valve in the left bottom corner (Auslass-Ventil), you can make the leakage of the wind trunk larger or smaller.