SOPP610: “Can finger substitutions be used in slow baroque music, such as Kyrie by Cabezon?"

Let’s start episode 610 of Secrets of Organ Playing Podcast. This question was sent by Joanna, and she writes: “Dear Vidas, can finger substitutions be used in slow baroque music, such as Kyrie by Cabezon? Or is it best to stick to articulated fingering even in relatively slow passages?”