ES P includes a lowpass filter that lets you contour the output signals from the oscillator.
Frequency knob: Set the cutoff frequency of the lowpass filter.
Resonance knob: Boost or cut portions of the signal that surround the frequency defined by the frequency 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.
1/3, 2/3, and 3/3 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 1/3, 2/3, or full-keyboard follow (3/3). If no button is active, the key you strike won’t affect the cutoff frequency. This makes the lower notes sound relatively brighter than the higher ones. If you choose 3/3, 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.
ADSR Int knob: Define the amount (depth) of cutoff frequency modulation applied by the envelope generator. (See ES P envelope and level controls.)
Velo Filter knob: 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.