10.6

Table Of Contents
204Logic Pro Instruments
Drive slider: Change the behavior of the Resonance parameter, which eventually distorts
the sound of the waveform. Drive is actually an input level control, which allows you to
overdrive the filter.
Key slider: Set the effect that keyboard pitch (the note number) has on filter cutoff
frequency modulation.
If Key is set to zero, the cutoff frequency does not change, no matter which key you
strike. This makes the lower notes sound comparatively brighter than higher notes.
If Key is set to maximum, the filter follows the pitch, resulting in a constant
relationship between cutoff frequency and pitch. This mirrors the properties of many
acoustic instruments, where higher notes sound both brighter in tone and higher in
pitch.
ADSR via Vel sliders: Drag to determine how note velocity affects modulation of
the filter cutoff frequency with the envelope generator. See Logic Pro ES1 envelope
parameters overview.
Filter Boost button (Extended Parameters area): Increase the output of the filter
by approximately 10 decibels. The filter input has a corresponding decrease of
approximately 10 decibels, maintaining the overall level. This parameter is particularly
useful when applying high Resonance values. See Overdrive the Logic Pro ES1 filter.
Overdrive the Logic Pro ES1 filter
If you increase the filter Resonance parameter to higher values, the filter begins to
internally feed back and, as a consequence, begins to self-oscillate. This results in a sine
oscillation—a sine wave—that is actually audible.
You can make the ES1 filter output a sine wave by following the steps below. This lets you
play the filter-generated sine wave with the keyboard.
Output a sine wave from the filter
1. In Logic Pro, switch the Sub knob to Off.
2. Drag the Mix slider to the very bottom (Sub).
3. Drag the Resonance slider to the maximum position (full).
4. If you want, click the disclosure triangle at the lower left to open the extended
parameters, then click the Filter Boost button.
Filter Boost increases the output of the filter by approximately 10 decibels, making the
self-oscillation signal much louder.