10.6

Table Of Contents
578Logic Pro Instruments
BR (band rejection): The frequency band directly surrounding the center frequency
(set with the Cutoff knob) is rejected, while the frequencies outside this band can
pass. The Resonance parameter controls the width of the rejected frequency band.
Set the Ultrabeat filter slope
Most filters don’t completely suppress the portion of the signal that falls outside the
frequency range defined by the Cutoff parameter. Frequencies that are located close to the
cutoff frequency are generally reduced less than those that are farther away. The higher
the slope value, the more apparent the level difference is between frequencies that are
near to the Cutoff frequency and those that are farther away from it.
In Logic Pro, click the 12dB or 24dB button. The slope (curve) chosen for the Filter
expresses the amount of rejection in decibels per octave. The steeper the slope, the
more severely the level of signals below the cutoff frequency is affected in each octave.
Use the Ultrabeat filter Cutoff parameter
In Logic Pro, rotate the Cutoff Frequency (Cut) parameter to control the brilliance or
determine the center frequency 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, the cutoff frequency determines the point where lower
frequencies are suppressed, with only upper frequencies allowed to pass.
In a bandpass/band-rejection filter, the cutoff frequency determines the center
frequency for the bandpass or band-rejection filter.
Use the Ultrabeat filter Resonance parameter
In Logic Pro, rotate the Resonance (Res) parameter to emphasize or suppress portions
of the signal above or below the defined cutoff frequency, or to determine the width of
the band that surrounds the cutoff frequency.
In a lowpass filter, Resonance emphasizes or suppresses signals below the cutoff
frequency.
In a highpass filter, Resonance emphasizes or suppresses signals above the cutoff
frequency.
In bandpass/band-rejection filters, resonance determines the width of the
frequency band that surrounds the center frequency (set with the Cutoff Frequency
parameter).