The question isn't how much Leslie, it the faithful reproduction of, in my case, the B-3 and a Leslie 122R. I am not technically proficient to try and explain it, but, when ramping up, you hear that distinct lower drum and the rotors revving up at different speeds and the same for slowing to a stop. Any old Doppler effect ain't gonna cut it.
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pa4X 76 ,SX900, Audya 76,Yamaha S970 , vArranger, Hammond SK1, Ketron SD40, Centerpoint Space Station, Bose compact