This is because the specifications of the instrument can make a great difference--how many manuals, how many ranks, how many stops, which stop on which manual; is it a French-, German-, or English-style organ (reflected by what names the stops and sections are given); is it an electropneumatic or tracker action; how is it placed within the hall/church? All of these questions can strongly influence the sound. I would go so far as to say that there is probably more variation between different instruments among organs than with any other instrument, almost to the extent that the pipe organ is less an instrument than a family of instruments. "Bruce Alan Wilson" <[log in to unmask]>