User Guide

346 Chapter 22 EVB3
Acc/Dec Scale
The Leslie motors need to physically accelerate and decelerate the speaker horns in the
cabinets, and their power to do so is limited. Acc/Dec Scale determines the speed at
which the motors can accelerate the rotors (time it takes to get the rotors up to a
determined speed), and the length of time it takes for them to slow down. If the slider
is set to its far left position, you can switch to the preset speed immediately. If you drag
the slider to the right, speed changes take more time to occur. In the default position
of 1 the behavior is Leslie-like.
Horn Deflector
If you look inside a Leslie cabinet, you’ll see a double horn, with a deflector at the horn
mouth. This deflector makes the Leslie sound. Some people, however, removed it to
alter the Leslie sound, as removal of the deflector increases amplitude modulation, and
decreases frequency modulation. This parameter allows you to switch the deflectors on
and off, without needing to order spare deflectors.
Mic Angle and Mic Distance
The Mic Angle slider defines the stereo image, by changing the angle of the simulated
microphones. An angle of 0° results in a mono sound, while an angle of 180° causes
phase cancellations. Experienced sound engineers tend to avoid wide spreads.
Mic Distance makes the sound darker, and less defined, when set to higher values. This
is typical of microphones, when positioned further from the sound source.
Motor Control
In the Motor Control menu, you can set different speeds for the bass and treble rotors:
 Normal: Both rotors use the speed set by the rotor speed buttons.
 Inv (inverse mode): In Tremolo mode, the bass compartment rotates with fast speed,
while the horn compartment rotates with slow speed, and vice versa in Chorale
mode. In Brake mode, both rotors will stop.
 910: The 910, or Memphis mode, stops the bass drum rotation at slow speed, while
the speed of the horn compartment can be switched. This may be desirable, if you’re
after a solid bass sound, but still want treble movement.
 Sync: The acceleration and deceleration of the horn and bass drum are about the
same. This sounds as if the two were locked, but is only clearly audible during
acceleration or deceleration.
Note: If you choose Single Cabinet in the Cabinet Type menu, the Motor Ctrl setting is
irrelevant, because there are no separate bass and treble rotors in a Single Cabinet.