A few weeks ago I had a wedding gig in an old beautiful and very big stone Church. When I arrived to the church to go through the solo pieces with the organist he told me that the old churchorgan was very flat. And indeed it was!. When tuning I found that the organ was a quarter tone too flat, maby even a little bit more When the organist played the consert Bb its pich was between Bb and A. I hade to pull out my tuning slide very faar. I used my Bb trumpet and I hade big problems to play with the tuning slidethat faar out...It made me miss a few notes at the gig just becouse the feling was way of. Have you any similar stories to share?