I uploaded this piece yesterday with a plenum registration (http://www.contrebombarde.com/concerthall/music/32043). That's how I heard this piece internally, so that's how I played it, without really thinking about it. One could question whether a plenum registration is suitable for a piece with the text "Be merciful to me, o God".
So I decided to do it again with a softer registration. Here it is with the Rohrflöte and Quintadena of the Zöblitz sample set.
I still like the plenum version better. I'm curious to know what other people think.