10.6

Table Of Contents
356Logic Pro Instruments
Filter parameters
On/off button: Turn the filter section on or off. The filter is enabled by default (indicated
by the lit button at the top left of the filter section). Disable the filter when adjusting
other sound controls because this makes it easier to hear changes.
Filter Type pop-up menu: Choose a filter type from the menu. There are eight lowpass
filters with different slopes, four highpass, four bandpass, a band reject, and a peak
filter available. Use the descriptive names—Creamy, Edgy, Gritty, Lush, Lush (Fat), and
Sharp—to make a choice that’s right for your sound. See Logic Pro Retro Synth filter
types.
LP (lowpass): Allows frequencies that fall below the cutoff frequency to pass.
You can choose one of four slopes from the eight models that change the tonal
characteristics of the filter, making it sound brighter, mellow, thinner, or fuller—
particularly in the bass end of the sound.
HP (highpass): Allows frequencies above the cutoff frequency to pass. There are
three slopes to choose from: 6, 12, and 24dB/octave.
BP (bandpass): The frequency band directly surrounding the cutoff frequency is
allowed to pass. All other frequencies are cut. The Resonance control sets the width
of the frequency band. Bandpass is a two-pole filter with a slope of either 6or 12 dB/
octave on each side of the center frequency.
BR (band reject): The frequency band directly surrounding the cutoff frequency is
rejected, but frequencies outside the band can pass. The Resonance control sets the
width of the rejected frequency band. Band reject has a slope of 6dB/octave.
Peak: A peak filter allows the level in a frequency band to be increased. The center
of the frequency band is set with the Cutoff control. The width of the band is set
with the Resonance control.
Cutoff control: Drag horizontally to set the brilliance of the signal.
In a lowpass filter: The higher the cutoff frequency is set, the higher the frequencies
of signals that are allowed to pass.
In a highpass filter: Cutoff sets the point where low frequencies are suppressed.
In a bandpass, band reject, or peak filter: Cutoff sets the center frequency of the
band that is allowed to pass, is suppressed, or is emphasized.
Resonance control: Drag vertically to boost or cut signal portions above, below, or
surrounding the cutoff frequency.
Key (Follow) slider: Determine the effect that keyboard pitch (the note number) has on
filter cutoff frequency modulation.
At the top position, the filter follows keyboard 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. At the
bottom position, the cutoff frequency does not change, regardless of which key (pitch)
you strike. This makes the lower notes sound relatively brighter than the higher ones.
Filter FM knob: Set the intensity of filter cutoff frequency modulation with the Oscillator
1 sine wave generator. Positions to the left set the strength of static sine wave
modulations. Positions to the right set the strength of envelope-controlled sine wave
modulations. The centered (off) position disables filter frequency modulation by the
Oscillator 1 sine wave generator.