Originally posted by Uncle Dave:
Oh my, no! The Leslie IS the sound. Always WAS the sound and always WILL BE the sound.
If you have th eoption - use the real deal. No effects needed. The doplar is all it needs to sizzzzzzle ! 
I would agree if you have a rhythm section, but if you are using your arranger for that (plus other sounds), bone dry everything is a hard pill to swallow for a spinner send... Unless you are in a VERY live room, anyway!