QUOTE (John Robinson @ Jun 1 2006, 07:30 PM)

I have just discovered that it is intended to insert a stop by the name of 'Donner 64' at Altenberg Cathedral, Germany.
I have been informed by the builders (Klais) that this is to be a resultant derived from the (also prepared for) Contraposaune 32'.
I was rather astonished to hear this, as I thought it was not possible/effective to make a reed resultant. I think this must be a unique concept but, of course, I stand to be corrected.
John
I had the privilege of playing the Altenberg organ in early August and can confirm that the acoustic Donner 64' does indeed exist.
The problem with assessing a stop like this is that one has no point of reference. There are only two full-length 64' reeds in the world and I am unlikely ever to hear either of them live. (I have heard recordings, but it is hardly the same thing.) So I can only take the stop at face value. Does it work? Well, I used it for the last three pedal notes of
Carillon de Westminster and the acoustic bit kicked in on the final bottom D. I think it does - just, by the skin of its teeth. Clearly you have to use it with care. It is aptly named!
Unfortunately time was so limited that I did not have the luxury of working out how the 64' is derived. The organ has two 32' pedal reeds - a Contrafagott and a very vulgar Contraposaune. The 64' definitely uses the Posaune, but whether it is quinted upon itself or with the Fagott I am not sure.
The Altenberg organ is fascinating and I wish I had had the time to explore it fully - but I think that would take months. The Brustwerk Septime 4/7' is an improviser's dream!
http://www.altenberger-dommusik.de/orgel.html