ES P filter parameters in Logic Pro for iPad
ES P provides a lowpass filter that lets you contour the output signals from the oscillator.
Filter parameters
Cutoff knob and field: Set the cutoff frequency of the lowpass filter.
Resonance knob and field: Boost or cut portions of the signal that surround the frequency defined by the cutoff knob.
Note: Increasing the Resonance value results in a rejection of bass—low frequency energy—when using lowpass filters. The ES P compensates for this side effect internally, resulting in a more bassy sound.
Keytrack buttons: The cutoff frequency can be modulated by MIDI note number (keyboard position); you may know this parameter as keyboard follow on other synthesizers. Choose Off, 1/3, 2/3, or Full keyboard follow. If the Off button is active, no keystrike will affect the cutoff frequency. Choosing a value other than Off makes the lower notes sound relatively brighter than the higher ones. If you choose Full, the filter follows the pitch, resulting in a constant relationship between cutoff frequency and pitch. This is typical of many acoustic instruments where higher notes sound both brighter in tone and higher in pitch.
Filter Env Depth knob and field: Define the amount (depth) of cutoff frequency modulation applied by the envelope generator. See ES P envelope and level controls.
Filter Vel knob and field: Set the velocity sensitivity of the cutoff frequency modulation applied by the envelope generator. The main envelope generator (ADSR) modulates the cutoff frequency over the duration of a note. The intensity of this modulation can respond to velocity information. If you play pianissimo (velocity = 1), the modulation is minimal. If you strike with the hardest fortissimo (velocity = 127), the modulation is more intense.
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