Purchase the correct adapter.You need an 11-pin adapter specifically designed for the Leslie 122. The Hammond has a single channel, so this adapter is required to connect the organ to the Leslie properly. Ask your music supply store for a Leslie 122 adapter.
Plug Leslie into the Leslie plug on your Hammond Organ. A Leslie 122 will not operate by itself. It must be plugged into the organ. Turn on the Leslie.
Buy a Leslie combo pre-amp. This pre-amplifier boosts the sound of the Hammond organ to levels the Leslie can use. If you use the preamp, you do not need to plug the Leslie into the organ because the pre-amp provides power.
Connect the Leslie to recording equipment or amplifiers with microphones. Use one microphone for a mono effect or two microphones for a stereo effect.