If the Leslie(or any other rotary clone) is used in a solo situation and not mic'ed, then it would be superior to a sim.

On the other hand, if the Leslie is mic'ed and pumped through a P.A. then the differences would be less obvious.

Ian
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Yamaha Tyros4, Yamaha MS-60S Powered Monitors(2), Yamaha CS-01, Yamaha TQ-5, Yamaha PSR-S775.