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Hmm, well, I wasn't there and I have no way of knowing if the recording is a true and accurate representation of the real sound especially as it comes out of my computer speakers.  To me, it doesn't sound any different than any Roots-blown 645, and if you had told me it was a 567, I would have assumed it was that too.  645s do have a little more "bark" to them but it's not a large difference.I used to fix these things so I'm very familiar with their sound. Beats me why one engine design sounds different than another.  I am aware of differences in bore, stroke, manifold, number of cylinders, etc., and I can even draw correlations.  In the field I can from experience tell without looking whether I'm listening to a 16-567C, 16-645C, or 16-645E, but how those differences cause the sound difference I do not know, and I don't wish to guess. S. Hadid
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