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Chapter 2 ES1 25
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Key slider: Drag to set the eect that keyboard pitch (the note number) has on lter cuto
frequency modulation.
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If Key is set to zero, the cuto frequency does not change, no matter which key you strike.
This makes the lower notes sound comparatively brighter than higher notes.
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If Key is set to maximum, the lter follows the pitch, resulting in a constant relationship
between cuto frequency and pitch. This mirrors the properties of many acoustic
instruments, where higher notes sound both brighter in tone and higher in pitch.
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ADSR via Vel sliders: Drag to determine how note velocity aects modulation of the lter cuto
frequency with the envelope generator. See ES1 envelope parameters overview on page 27.
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Filter Boost button (Extended Parameters area): Turn on to increase the output of the lter by
approximately 10 decibels. The lter input has a corresponding decrease of approximately 10
decibels, maintaining the overall level. This parameter is particularly useful when applying high
Resonance values. See Drive the ES1 lter to self-oscillate. (Click the disclosure triangle at the
lower left of the ES1 interface to access the Extended Parameters area.)
Drive the ES1 lter to self-oscillate
If you increase the lter Resonance parameter to higher values, the lter 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 lter output a sine wave by following the steps below. This lets you play
the lter-generated sine wave with the keyboard.
Output a sine wave from the lter
1 Switch the Sub knob to O.
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 lter by approximately 10 decibels, making the self-
oscillation signal much louder.