The Weissenau organ is one of my favorite. It has a strong french personnality, and french baroque or classical music is easily playable on it.
I tried this Magnificat on another sample, but Weissenau is for me the most convincing in this work.
1. Plein jeu
4. Dialogue sur les grands jeux
6. This piece is called Prélude in the MS. I think it's not a plein jeu. The writing is that of a "basse de trompette". I play it so.
7. Rondot (Rondeau). After working and analysing the piece I thing there is perhaps a mistake in the order of the Refrain and Couplets. I record my version, not the one of the MS.