SOPP324: I have heard it is possible to create the illusion of a 32' in the pedals

Let’s start episode 324 of Secrets of Organ Playing Podcast. This question was sent by Dieter and he writes: Good evening Ausra and Vidas. Just recently something electrical malfunctioned on our Churches organ. As a result we lost the 32' and 16' ranks in the pedals. Only 8' and 4' left. I have heard it is possible to create the illusion of say a 32' by playing two notes on a 16' in the pedals. I am not averse to playing a two note chord in the pedals, as long as it is not too complicated for hymn accompaniment, a bit like a drone. Question is which two notes? Dieter