Guillaume Lasceux (1740-1831), 6. Duo in g minor. Sheet music can be found in Incognita Organo, volume 11. The registration can be found at the end of the piece. More pieces of Lasceux can be found in my playlist: https://www.youtube.com/playlist?list=PLNFZTCpjQ59UNU6_V2rIKJTzcVEGx4KOK
Played on Sonarte organ with Hauptwerk, 2010 Mascioni, Alessandria, Chiesa, di San Giovanni Evangelista, Italy