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Table Of Contents
Chapter 15 Vintage B3 419
Leakage slider: Drag to add a sound resulting from the crosstalk between all tonewheels—
including the tonewheels of notes that you don’t play. Adjust this slider to add a “breathy
quality to your organ sound.
Drawbar Leak slider: Drag to set the minimum output level of the draw bars when they are
at their minimum positions. The B3 tonewheel generators aren’t completely quiet, even if all
draw bars are at their minimum positions. This is due to leakage of the tonewheels, causing
crosstalk at the output.
Use the minimum setting to completely eliminate draw bar leakage.
Use the maximum setting to make draw bar leakage clearly audible.
Crosstalk slider: Drag to set the crosstalk level. There are two tonewheels that are four
octaves apart for each key (pitch), on each rotating shaft. The signal of the lower wheel has
a small amount of audible crosstalk, induced by the higher wheel, and vice versa. For more
information, see Tonewheel sound generation on page 428. Because crosstalk is audible only
on certain B3 tonewheels, any rumble” when chords are played is avoided.
Random FM slider: Drag to simulate irregular rotation of tonewheels in an old B3. If the
tonewheel generator of a B3 is clean, all frequencies are even and in tune. The three-fold
decoupling of the tonewheels—via springs, exible couplings, and ywheels—is eective,
but it can’t compensate for irregularities that come with dirt and grease in the driving gears.
A gradual build-up of grime in the mechanism makes the tonewheel assembly turn unevenly
on its axis. This irregular rotation is transmitted to the tonewheels, and therefore, the higher
frequency ranges of the sound.