A new lesson. For the moment it's the best I can :-)
The first part is with the Plein jeu,
the adagio (after 6.42) is played with the Montre on the left hand and the bourdon, prestant and Nasard with the right hand.
The fuga (after 11.15) is played on the positief with the bourdon, prestant and doublette, the pedal is played with the Subbas and the trompet.