10.6

624Logic Pro Instruments
Logic Pro Vintage B3 draw bar controls
Vintage B3 provides 20 draw bars, nine each for the upper and lower manuals, and two for
the pedalboard. The upper manual draw bars are on the left, the pedal draw bars are in the
center, and the lower manual draw bars are to the right.
Drag down the draw bars to make the selected sine choirs louder. You should note that
MIDI control of the draw bars is also reversed when using a standard MIDI fader unit.
Each sine choir is a sine wave that is mixed in at a particular level, determined by the draw
bar position. You add sine choirs in this way to build up the overall organ sound for the
upper or lower manual. This is a basic form of additive synthesis; for more information, see
Additive synthesis with draw bars. You can intuitively pick up the fundamental principles of
additive synthesis by playing a little with the draw bars.
Two draw bars are available for the bass pedals. The waveform used for the bass pedal
sound is not a pure sine wave, like the waveforms used for the upper and lower manuals.
The pedalboard sound uses a mixed waveform, which accurately emulates B3 bass tones.
The two registers differ in pitch, with the left, 16-foot register containing more octave
harmonics. The right, 8-foot register has a more prominent fifth portion (fifth harmonics
are enhanced). The term foot is derived from pipe organ lengths.
You can simulate the behavior of the Model A, the first Hammond organ ever made. This
model had no foldback for the 16’ draw bar in the lowest octave, with the bottom 12 tone
generator outputs available on the first draw bar of the manuals’ bottom octave. Without
foldback, the sound is more strident and similar to the pedal sound. In controls view,
choose “all the way down” from the Bass pop-up menu to simulate the Model A.
Logic Pro Vintage B3 Scanner Vibrato and Chorus
Vintage B3 emulates the Scanner Vibrato of the original B3. Few organ players use the
Scanner Vibrato, preferring to work with a Leslie in isolation. Others, like B3 virtuoso Brian
Auger, prefer the integrated organ vibrato over the Leslie. Compare the chorus and vibrato
effects with the sound of the rotor cabinet simulation to see which you prefer.
The Scanner Vibrato is based on an analog delay line, consisting of several lowpass filters.
The delay line is scanned by a multipole capacitor that has a rotating pickup. It is a unique
effect that cannot be simulated with low frequency oscillators (LFOs). The vibrato of the
organ itself should not be confused with the Leslie effect, which is based on rotating
speaker horns. Vintage B3 simulates both.
The (Scanner Vibrato) Chorus effect is derived from mixing the vibrato signal with the
original, statically pitched signal. The organ chorus sounds different from modern chorus
effects.