You don’t need any other pedals to replicate the B3 organ. If you want the ‘B3 into a Leslie speaker’ sound you could use a flanger, but a far better option is the Neo Ventilator; it’s a very convincing sound, and offers the ability to ramp the swirling speaker up and down like the real thing.

The foot controller has a few ‘built-in’ presets installed. I found them replicated throughout (ie the sound found on setting 25 is same at 35, 45, 55 etc.).