telemanr wrote:The Caen sample set which was used for the Widor does not have a fourth manual. That explains why you wouldn't see it being used here.
Quite clear, thanks for the explanation Rob.
In general Widor tells you what manuals to use with what stops and how they should be coupled. In the case of the Toccata, he only tells you the dynamics he wants. It starts marked fff which would imply the Grande Orgue which on this organ would be the lowest manual with the next two coupled down to it. Only the Recit (third up) is enclosed so it can be used open for the fff and closed for lesser dynamics without changing any stops. The piece is not intended to be played with hands separated.
My apologies for my remarks... If I have heard quite a lot this part of the 5th Symphony, it was the first time I could see it being played. I was under the impression it should be done in a different way, but I know realise thanks to you I was completely wrong.