This is a very simple sound, just white noise thru a filterbank - it surprised me how well this emulates a B3 type organ. The "Noise" parameter controls the bandwidth of the filterbank - the wider the bandwidth the more noise comes through. Wider bandwidths have greater random pitch deviation from the center frequency which adds chorusing. The combination of increased (wind) noise & chorusing sounds something like a Leslie - just a happy accident. At very narrow bandwidths it starts to sound bellish.

-- RobRayle - 23 Jan 2006