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Chapter 9 MIDI plug-ins 18 0
Modulation LFO parameters
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LFO on/o button: Turns the LFO on or o.
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Waveform Shape buttons: Click to select a waveform shape. Choose from: triangle, sine, square,
and random. Each is suited for dierent types of modulations.
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Waveform display: Shows the LFO waveform shape.
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Symmetry slider: Drag to adjust the symmetry of the waveform. This deforms the waveform in
the following ways:
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Triangle: Shapes the triangle waveform into either an upward-sawtooth or downward-
sawtooth waveform. A symmetry value of 0 results in a perfect triangle waveform.
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Sine: Compresses the sine wave into one narrow and one wide duty cycle. A symmetry value
of 0 results in a perfect sine waveform.
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Square: Symmetry acts as a pulse width control. A symmetry value of 0 results in a perfect
square waveform.
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Random: Symmetry determines the maximum deviation between two consecutive
random values. Low symmetry settings result in random values that are minimally dierent
from one to the next, whereas high symmetry settings result in random values that
deviate signicantly.
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Trigger switch: Choose a switch position to determine how the LFO reacts to incoming MIDI
note on messages.
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Free: The LFO ignores MIDI note on messages.
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Single: After all notes have been released, the LFO is reset by the rst MIDI note on message
it receives.
Note: This means that legato playing does not reset the LFO, so keep this in mind
during performances.
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Multi: The LFO is reset by each received MIDI note on message.
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Steps per LFO Cycle (Smoothing) slider and eld: Drag to determine the number of steps per
LFO cycle.
By default, the LFO produces a smoothed continuous stream of controller events, but you
can use this parameter to create a stepped controller signal that is similar to the output of
a Sample and Hold circuit. When you set a manual step rate, the LFO rate can be changed
without altering the number of steps.
Note: If the square or random waveform is selected, the Steps per LFO Cycle slider is
renamed to Smoothing. The slider smooths the normally steep slopes of the square and
random waveforms.
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Rate knob: Rotate to set the cycle speed of the LFO in hertz or in beat values when the Sync
button is turned on. The LFO rate can be modulated by the envelope. See Modulator MIDI
plug-in envelope.
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Sync button: Turn on to synchronize the LFO rate to the Logic Pro song tempo.
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To pop-up menu: Choose a continuous controller number, aftertouch, or pitch bend as the LFO
output target.
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Output Level slider: Move to scale the LFO output level.
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Oscilloscope: The Oscilloscope to the left of the Output Level slider displays the shape of the
LFO control signal before it is scaled.
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MIDI Channel pop-up menu (extended parameter): Click the disclosure triangle at the lower left.
Choose a MIDI output channel.