Fred, I had some items due at the library today, and while I was there I picked up a Bach organ CD by Michael Murray on Telarc. It also has BMV 654 and on that segment a little over three minutes in, the low bass notes are just a bit more prominent, but not greatly different. By the way, I'd assumed that your track 8 reference was a typo, but we are talking about BMV 654?

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Enjoy the music, not the equipment.