Acceleration knob and field: Set the time required for the rotors to attain the speed set with the Max Rate knob and also the time required for them to slow down. The Leslie motors need to physically accelerate and decelerate the speaker horns in the cabinets, and their power to do so is limited. Turn Acceleration to the far left position to switch to the preset speed immediately. As you rotate the knob to the right, it takes more time to hear the speed changes. At the default, centered, position the behavior is Leslie-like.
Max Rate knob and field: Set the maximum possible rotor speed.
Motor Control pop-up menu: Choose different speeds for the bass and treble rotors. Use the Rotation switch to choose slow, brake, or fast mode. See PDF
Control Surfaces Support Guide: PDF