8.3.2. Rotary Speaker
The rotary speaker cabinets were invented by Donald Leslie in 1940. They became
inseparable add-ons to the Hammond organ, to the point of being almost impossible to
see one without the other. The Leslie expressiveness was given by means of the rotating
horn and drum speakers inside the cabinet, that could rotate at variable speeds, usually
controllable by the player, to produce the characteristic swirling chorus effect that greatly
contributed to the fame of the Hammond organs.
A vacuum tube amplifier capable of being overdriven up to distortion adds an extra
expressiveness dimension.
The Leslie 122 cabinet was the most popular, and was designed specifically for the
Hammond. It is a dual speed cabinet. Later, Leslie created the Leslie 147, intended to be a
"universal" cabinet to be used by any organ. It was also dual speed.
Other instruments also took advantage of the expressiveness of the rotary speaker cabinets.
The Mellotron was one of those instruments that sometimes were used with these cabinets,
so we added an emulation to the Mellotron V to help recreating that sound.
The Mellotron V
Rotary Speaker
amplifier has many controls, divided by two panels. In the
Main panel we have: Fast (accelerates the rotation effect), Brake (stops the rotation, forcing
a mono signal), Stereo, Balance, Drive, Dry/Wet.
In the Advanced panel we have: Horn (Slow, Fast, Accel), Drum (Slow, Fast, Accel). These
controls allow for greater control of the rotary speaker effect, and they are MIDI controllable
and automatable.
Arturia - User Manual Mellotron V - Mellotron V Effects
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