10.6

647Logic Pro Instruments
Condition parameters
• Click Minimum/Maximum sliders: Combined, these sliders determine a range for click
duration, which can vary between a short “tick” and a longer “scratch.” A random click
duration (that falls within the defined range) is used as you play.
Note: Even if both parameters have identical values, there is a random variation in
sound that makes some clicks seem shorter than the value set with Click Min.
• Click Color slider: Set the tonal color of the click. This acts as a global control for the
treble portion of the click sound, which overrides (but works alongside) random click
color variations.
• Filter Age slider: Set the center frequencies of the filters to emulate aging capacitors.
The high frequency output signals of B3 tonewheel generators are passed through
bandpass filters. The center frequency of these filters changes as the capacitors (used
for filtering) get older.
Note: This colors the sound of the jitter applied by Random FM and the background
noise resulting from leakage. Filter Age also influences the intonation of the organ, if
you use a pitch bend.
• Leakage slider: Add a “breathy” quality to your sound—the result of crosstalk between
all tonewheels—including the tonewheels of notes that you don’t play.
• Drawbar Leak slider: 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: 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. Because crosstalk is audible only
on certain B3 tonewheels, any “rumble” when chords are played is avoided.
• Random FMslider: 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, flexible couplings, and flywheels—is
effective, 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.