I would to find out how difficult it is to write a passacaglia. Here is the result. If you want to have the PDF, you can download it from http://www.facebook.com/karel.vaningen.5 or send me an email:
In the PDF you can also see the registration how I played it on the "little" organ of Kampen.
(I recorded it about a year ago, and I was not so good in taking the parts together to 1 part)