Speaking of visual aspects; some time ago I made a test setup for comparing built-in clonewheel leslie simulator and a real 147 so that I was able to swap between PA and Leslie. The same half-moon speed switch controlled both simulator and real one. Just soundwise it was clear that in such kind of A-B comparison test the real leslie was a winner, but when switched to simulator it was somewhat confusing to actually see horn still spinning even though sound came from PA. So a digital simulation also sounded better when it looked real...
