About 1/2 way through, I turn off the blower and let the organ start detuning.
I wanted to demonstrate the wind modelling system in Hauptwerk. While this isn't a sound you likely want to incorporate in your own playing, it does demonstrate that the system exists and that it works.
Apologies for my playing skills. The word "playing" is extremely generous.
To read more about the wind system go to "the Barde" and read the blog "Fun With Wind Modelling"