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FXAlg #735/6: KB3 FX
Vibrato/chorus into distortion into rotating speaker into cabinet
Allocation Units: 7 for full working effect (4 for KB3 FXBus, 3 for KB3 AuxFX)
The KB3 FXBus and KB3 AuxFX algorithms contain multiple effects designed for the Hammond B3 emulation (KB3
mode). For correct operation, both effects must be running at the same time, with the output of KB3 FXBus feeding
the input of KB3 AuxFX. The two algorithms work as one algorithm which use all the available KDFX resources.
While the input to KB3 FXBus is stereo (which gets summed to mono) and the output from KB3 AuxFX is stereo,
the signals between the two algorithms are the low frequency (left) and high frequency (right) signal bands used to
drive the lower and upper rotary speakers. It is possible to run these two algorithms as independent effects, but it
is recommended.
These effects are the Hammond vibrato/chorus, amplifier distortion, and rotating speaker (Leslie) emulations.
Each of these effects may be turned off or bypassed, or the entire algorithm may be bypassed. To bypass the rotary,
the switches in both KB3 FXBus and KB3 AuxFX must be set to ÒOutÓ.
L Input
R Input
L Input
Rotator
R Input
Rotator
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.
The vibrato chorus has been carefully modeled after the electro-mechanical vibrato/chorus in the B3.
An amplifier distortion algorithm follows the vibrato/chorus. For details, see the section in this book on FXAlg
#723.
The distorted signal is next passed to a cabinet emulation filter and a pair of crossover filters for band splitting. The
measurements of a real Leslie¨ speaker was used in the design of these filters. Default parameter values reflect
these measurements, but you may alter them if you like. The Lo HP parameter controls a hipass filter which defines
the lowest frequency to pass through the speaker. Likewise the Hi LP parameter is a lowpass filter controlling the
Vibrato/
Distortion
Chorus
Block diagram of KB3 FXBus
Pan
Pan
Mic Levels
Pan
Pan
Block diagram of KB3 AuxFX
Cabinet
Filter
FXAlg #735/6: KB3 FX
Hi Gain
L Output
Lo Gain
R Output
L Output
Out Gain
R Output
Algorithm Reference-113
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