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It is generally agreed by experts, that it is the wind behavior which makes the beauty of the organ sound. In early times, wedge bellows were used in organs which were pulled up by "calcants". There were usually several sets of bellows to feed the organ so that the wind achieved some stability. Nevertheless, the procedure of pumping and also the changing torque of the falling moving board as the bellows were deflating, caused slight changes in pressure, slight oscilations which affected the pipe speech. Also, the wind stability was so delicate that playing on one manual with just one or two stops affected the speech of pipes played on a different manual. After the parallel rise bellows were invented, andafter organ blowers invaded churches, these subtle wind behavior was lost to great deal. With the help of Hauptwerk, we can now model the original situation of the hand pumped bellows. Together with carefully modelled response of pipes, it is completely new experience of the organ sound.

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