10.6

Table Of Contents
302Logic Pro Instruments
Filter parameters
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 Logic Pro 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.
Logic Pro ESP envelope and level controls
ESP features an ADSR envelope that affects both the filter cutoff (ADSR Int) and the level
of the sound over time. This section also covers the master level control parameters.
Envelope and level parameters
Attack slider: Set the time required for the signal to reach the initial signal level (the
sustain level).
Decay slider: Set the time it takes for the signal to fall from the attack level to the
sustain level.