Like a sub kick frequency. What a trip. It's really an effect with the left hand doing the bass line. Very interesting. I will try this when I get my Hammond pedals.
The Hammond Console Pedals sound better (and the 8' Drawbar is more useful) if you Disconnect the Orange (2-2/3&2') and Yellow (1-3/5&1-1/3') wires from the Pedal Signal this gives a sound closer to a Manual 88 8800 000 sound. The higher pitches are more intended as a Cornet ("Kōr-Nāy") sound for Classical playing and to make the Bass part more auditable over household AM Radios. The 5-1/3' Drawbar adds a Resultant to disguise the Tenor C Foldback.