10.6

Table Of Contents
576Logic Pro Instruments
HP (highpass): This filter type allows frequencies above the cutoff frequency to
pass. The filter slope is fixed at 12dB/octave.
BP (bandpass): The frequency band directly surrounding the center frequency
(determined with the Cutoff knob) is allowed to pass. All other frequencies are cut.
The Resonance parameter controls the width of the frequency band. The bandpass
filter is a two-pole filter with a slope of 6dB/octave on each side of the center
frequency of the band.
byp (bypass): Disables the integrated filter.
Cutoff and Resonance knobs: Rotate to set the cutoff/center frequency and resonance/
bandwidth behavior of the noise generator integrated filter.
The Cut knob defines the point in the frequency spectrum where the signal is
boosted or cut. Depending on the selected filter type, you can make a sound darker
(LP), thinner (HP), or more nasal (BP) by adjusting the Cut value. Cutoff can be
modulated by sources in the mod and via pop-up menus.
Increasing resonance boosts frequencies that surround the cutoff frequency. Values
range from 0 (no increase) to self-oscillation of the filter at high resonance values.
Self-oscillation is typical of analog filter circuits. It occurs when the filter feeds back
into itself and begins to oscillate at its natural frequency when high resonance values
are used.
Dirt knob: Set higher values to alter the white noise signal, making it more grainy. The
Dirt parameter is particularly effective at high resonance values. Dirt can be modulated
by sources in the mod and via pop-up menus.
Volume knob: Rotate to set the output level of the noise generator. Volume can be
modulated by sources in the mod and via pop-up menus.
Signal Flow button: Use to route the noise generator signal through the main Ultrabeat
filter or directly to the EQ (Output) section. When turned on, the button is lit and an
arrow indicates the direction of the signal flow.
Note: The Signal Flow button has no effect on the independent filter within the noise
generator. The independent filter is deactivated with the “byp” button. It is therefore
possible to filter the noise generator signal twice. In some instances you may want the
noise generator signal to bypass the main filter, thus freeing the main filter for other
drum sound processing duties.