10.6

387Logic Pro Instruments
Waveform Comments
Square Use of square/rectangle waves periodically switches the LFO between two
values. The upper wave cycle switches between a positive value and 0.
The lower wave cycle switches between a positive and a negative value
set to the same amount above or below 0. You can achieve an interesting
effect by modulating the Pitch target with a suitable modulation intensity
that leads to an interval of a fifth.
Random The two Random waveforms output random values. A random value is
selected at regular intervals, as defined by the LFO Rate parameter. The
Random waveform steps between randomized values (rapid switches
between values). The Smoothed Random wave moves more fluidly
between values.
Tip:A random modulation of Pitch leads to an effect commonly referred
to as a random pitch pattern generator or sample and hold. Try using very
high notes, at very high rates and high intensities—you’ll recognize this
well-known effect from hundreds of science fiction movies.
Use the Sampler LFO ramp generator
You can use the Sampler LFOs ramp generator to set the time it takes for the LFO
modulation to fade in or fade out. When you set the Fade field to a value of zero no fade in
or fade out occurs.
Set the LFOmodulation fade time
In Logic Pro Sampler:
• To fade in the modulation: Click the Fade In button, then vertically drag the Fade field to
a value greater than zero.
The higher the value, the longer the delay time before the LFO modulation starts.
• To fade out the modulation: Click the Fade Out button, then vertically drag the Fade
field to a value greater than zero.
The higher the value, the longer the fade out time for the LFO modulation.
Set up a delayed vibrato
You may often use the LFO ramp generators to introduce a delayed vibrato; many
instrumentalists and singers intonate longer notes this way.
1. In Logic Pro Sampler, click the Mod Matrix button in the Navigation bar to view the Mod
Matrix pane.
2. Click the + button to create a new modulation routing.
3. In the modulation routing, choose Pitch in the Target pop-up menu and choose LFO 1 in
the Source pop-up menu.
4. Set a slight modulation intensity with the Amount slider.
5. In the Modulators pane, set an LFO1 Rate of about 5Hz.
6. Choose Triangle in the LFO 1 Waveform pop-up menu.
Tip: Chaotic and fast modulations of frequencies (choose Pitch from the Target pop-
up menu) by any LFOsource—with a delayed Random waveform, a high Rate, and short
fade-out time—are ideal for emulating the attack phase of brass instruments.
7. Click the Fade In button, then vertically drag the Fade field to a value greater than zero.