Hello,
I totally agree with JPD: the rotary effect, if lacking of slow/fast fast/slow time of change parameter is unrealistic.
The strange thing is that on my old Clavinova CVP309 (manufactured in 2004....), the Rotary effect is perfect, including the parameter for setting the time to change from slow to full fast speed, and viceversa.
On Genos this parameter (as shown in Genos Data List file) is absent in many Rotary effects, but is available in "Real Rotary" (Slow-Fast time of Horn; Fast-Slow time of Horn); and in "Rotary Speaker 1" (Slow-Fast time of Woofer; Slow-fast time of Horn).
IMHO it should be available in all Rotary effect.