The LFO (low frequency oscillator) generates an adjustable, cyclic waveform that you can use to modulate other ES1 parameters.
Wave knob: Set the LFO waveform. Each waveform has its own shape, providing different types of modulation.
You can choose the following waveforms: triangle; ascending and descending sawtooth; square wave; sample & hold (random); and a lagged, smoothly changing random wave.
You can also choose EXT to assign a side-chain signal as a modulation source. Choose the side-chain source channel strip from the Side Chain pop-up menu in the upper-right corner of ES1. See Work in the plug-in window.
Rate dial and field: Set the speed, or frequency, of the LFO waveform cycles.
If you set values to the right of 0, the LFO phase runs freely.
If you set values to the left of 0, the LFO phase is synchronized with the tempo of Logic Pro X—with phase lengths adjustable between 1/96 bar and 32 bars.
When set to 0, the LFO outputs at a constant, full level, which allows you to manually control the LFO speed with your keyboard modulation wheel. For example, to change the pulse width by moving your keyboard modulation wheel, choose pulse width as the LFO modulation target and set the modulation intensity range using the Int via Whl slider.
Int via Whl slider: Move the upper arrow to set LFO intensity at the maximum modwheel position. The lower arrow defines LFO intensity when the modwheel is set to zero. The distance between the arrows—shown as a green bar—indicates keyboard modulation wheel range.
You can simultaneously adjust the modulation range and intensity by dragging the green bar, thus moving both arrows at once. Note that as you do so, the arrows retain their relative distance from each other.