Korg microARRANGER Owner's Manual page 203

Rotation will occur when the value of the modulation source is less
than 64, and will stop when the value is 64 or greater.
b: Sw
This parameter sets how the rotation speed (slow and fast) is
switched via the modulation source.
When "Sw" = Toggle, the speed is switched between slow
and fast each time you press the pedal or operate the joy-
stick.
Slow/fast will alternate each time the value of the modulation source
exceeds 64.
When "Sw" = Moment, the speed is usually slow. It becomes
fast only when you press the pedal or operate the joystick.
When a value for the modulation source is less than 64, "slow"
speed is selected, and when the value is 64 or higher, "fast" is
selected.
c: Manual Speed Ctrl
If you wish to control the speaker rotation speed manually, not
switching between Slow and Fast, select the modulation
source in the "Manual Speed Ctrl" field. If manual control is
not necessary, set this field to Off.
d: Horn Acceleration, e: Rotor Acceleration
On a real rotary speaker, the rotation speed is accelerated or
decelerated gradually after you switch the speed. The "Horn
Acceleration" parameter sets the speed at which the rotation
is accelerated or decelerated.
g: Mic Distance, g: Mic Spread
This is a simulation of stereo microphone settings.
Mic Spread
Microphone
Mic Distance
Rotary Speaker (Top View)
Effects 201
Mod./P.Shift
Rotary Speaker - Mic Placement
Microphone
Mic Distance