Guillaume Lasceux (1740-1831) was a French organist from what is usually called in France "the post-classic school", Couperin, Grigny and their contemporaries being the "classical school".
The post-classic organ music is most often either ignored or despised as decadent. In fact, it's simply the French organ music meeting the "viennese classical style" of the end of the 18th.
The result is often quite pleasing music, if not deeply metaphysical.
There are two versions of this piece :
: with the normal registration (voix humaine and some flues)
: with an "incorrect" registration using flutes only. IMHO, the piece keep its charm, in a different way, and sounds a bit like some Knecht.