User Guide

FXAlg #733: VibChor+Rotor 2 ¥ FXAlg #734: VibChor+Rotor 4

Algorithm Reference-106

FXAlg #733: VibChor+Rotor 2 ¥

FXAlg #734: VibChor+Rotor 4

Vibrato/chorus, through optional distortion, into rotating speaker

Allocation Units: 2 for VibChor+Rotor 2; 4 for VibChor+Rotor 4

The VibChor+Rotor algorithms contain multiple effects designed for the Hammond B3

emulation (KB3 mode).

These effects are the Hammond

vibrato/chorus, amplifier distortion, and rotating speaker (Leslie

). Each of these

effects may be turned off or bypassed, or the entire algorithm may be bypassed.

Block diagram of VibChor+Rotor

The first effect in the chain is the Hammond vibrato/chorus algorithm. The vibrato/chorus has six settings which

are the same as those used in the Hammond B3: three vibrato (V1, V2, V3) and three chorus (C1, C2, C3) settings. In

VibChor+Rotor 4, the vibrato chorus has been carefully modeled after the electro-mechanical vibrato/chorus in the

B3. The vibrato/chorus in VibChor+Rotor 2 uses a conventional design, which has been set to match the B3 sound

as closely as possible, but does not quite have the same character as the VibChor+Rotor 4 vibrato/chorus.

In VibChor+Rotor 4 an amplifier distortion algorithm follows the vibrato/chorus. See the section in this book on

FXAlg #724 for more information about the distortion algorithm.

Finally, the signal passes through a rotating speaker routine. The rotating speaker has separately controllable

tweeter and woofer drivers. The signal is split into high and low frequency bands and the two bands are run

through separate rotors. The upper and lower rotors each have a pair of virtual microphones which can be

positioned at varying positions (angles) around the rotors. An angle of 0° is loosely defined as the front. You can

also control the levels and left-right panning of each virtual microphone. The signal is then passed through a final

lowpass filter to simulate the band-limiting effect of the speaker cabinet.

Pan

L Output

R Output

Mic Levels

Out Gain

Cabinet

Rotator

Vibrato/

Chorus

Distortion

(Optional)

L Input

R Output