Program Descriptions
Lexicon
4-10
ROTARY
Rotary speaker cabinets were designed to provide a
majestic vibrato/choir effect for electronic theater and
church organs. The most well known rotary speaker is
the Leslie™ Model 122, which has two counter-rotating
elements: a high-frequency horn and a low-frequency
rotor with slow and fast speeds. The sound generated as
the spinning elements change speed is truly magical.
The swirling, spacious effect is difficult to describe - but
clearly recognizable.
The Rotary programs are a detailed simulation of a
Leslie-style cabinet. The input signal is split into high and
low-frequency bands. The rotation effect is created by a
synchronized combination of pitch shifting, tremolo,
and panning. Like the physical cabinet, the high (horn)
and low (rotor) frequencies are “spun” in opposite
directions. Horn and rotor speeds are independent, and
designed with acceleration and deceleration
characteristics to simulate the inertia of the original
mechanical elements.
A virtual requirement for organ music, Rotary programs
also sound remarkable with guitar and electric piano
rhythm parts. In fact, these programs are great
alternatives to chorus and tremolo effects for any sound
source.
To achieve the full effect, set the front panel Mix knob to
Wet for all variations of this program (9 to 16).
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