The sample set uses two very special virtual stops Anima and Spiritus. These stops do not sound at all, but they animate the instrument. They add a lot of wind consumption to the corresponding divisions, thus resulting in very lively wind pressure changes. It creates a nice effect of a wind shortage (wind sag), which is sometimes very characteristic of small chair organs.
This very modern improvisation uses this novelty for maximum effect.
I. Caminata, Cuspida; Spiritus
II. Pileata, Amabilis; Anima
P. Profunda, Sonora
I+II, P+I, P+II