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ES2 LFO waveforms in Logic Pro for iPad

Choose a waveform for LFO 1 or LFO 2 from the respective Waveform pop-up menu. The table outlines how these waveforms can affect your sounds.

Tip: Try using different waveforms while a modulation routing of Pitch123 (the pitch of all three oscillators) is engaged and running.

Waveform

Comments

Triangle

Suitable for vibrato effects.

Sawtooth

Suitable for helicopter and space gun sounds. Intense modulations of oscillator frequencies with a negative (inverse) sawtooth wave lead to “bubbling” sounds. Intense sawtooth modulations of lowpass filter cutoff and resonance creates rhythmic effects. The inverted sawtooth waveform provides a different start point for the modulation cycle.

Rectangle

Rectangular waves periodically switch the LFO between two values. The Unipolar rectangular wave switches between a positive value and zero. The Bipolar wave switches between a positive and a negative value set to the same amount above/below zero. An interesting effect can be achieved by modulating Pitch123 with a suitable modulation intensity that leads to an interval of a fifth. Choose the upper rectangular wave to do so.

Sample & Hold

The bottom two LFO waveforms output random values. A random value is selected at regular intervals, defined by the LFO rate. Sample & Hold steps between randomized values—rapid switches between values. Smoothed Sample & Hold results in fluid changes to values. The term Sample & Hold (S & H) refers to the procedure of taking samples from a noise signal at regular intervals. The values of these samples are then held until the next sample is taken.

Tip: A random modulation of Pitch123 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.

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