10.6

Table Of Contents
362Logic Pro Instruments
Although they are oscillators, LFOs are not audible—but their effects can certainly be
heard. The sole purpose of an LFO is to modulate other sound generating elements of the
synthesizer.
LFO/Vibrato parameters
LFO/Vibrato tabs: Change between LFO and Vibrato parameter panes.
Waveform display: Click the buttons at the top of the display to independently choose
an LFO or Vibrato waveform.
The sawtooth waves are suitable for bubbling, rhythmic effects.
The triangle wave is suitable for vibrato and other evenly-modulated effects.
The rectangular waves switch between two values, which is useful for stepping the
oscillator pitch by a fifth, for example.
LFO Sync switch: Turn on to synchronize the modulation speed with the host tempo.
Turn off to control the modulation speed manually.
Rate slider: Independently set the maximum LFO or Vibrato speed.
Source pop-up menu: Choose your MIDI keyboard Mod Wheel, Aftertouch, or Modwheel
+ Aftertouch as the control source for the LFO or Vibrato output level.
Logic Pro Retro Synth envelopes
Retro Synth features two identical attack, decay, sustain, and release (ADSR) envelopes
that shape the filter cutoff and the level of the sound over time.
When you think of different sounds, such as a snare drum, piano, or strings, they’re not
only tonally different, but the characteristics of the sound change over time. Both the snare
drum and piano are heard immediately when struck. This is because they both have a short
attack phase. Bowed strings, on the other hand, slowly ramp up in level—they have a long
attack time, in other words.