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Table Of Contents
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: Determine the cutoff/center frequency and
resonance/bandwidth behavior of the integrated filter.
Cutoff can be modulated by the sources found in the “mod” and “via menus.
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.
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.
Note: 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: This parameter was especially developed for the noise generator. Higher
values roughen up the pure, white noise appreciably, making it more grainy.
The Dirt parameter is especially effective at high resonance values.
Dirt can be modulated by the sources found in the “mod” and “via menus.
Volume knob: Sets the output level of the noise generator. Volume can be modulated
by the sources found in the “mod” and “via menus.
Signal Flow button: Determines whether the noise generator signal is routed through
the (main) filter, or directly to the EQ (output) section. When active, the button turns
red and an arrow indicates the direction of the signal flow.
Note: The signal flow button has no effect on the independent filter contained in the
noise generator. The latter is deactivated with the byp button in the Type menu. It is
therefore possible to filter the noise generator signal twice. In many instances you may
want the noise generator signal to bypass the main filter, freeing the main filter for
other duties—an important element when programming drum sounds.
Getting to Know the Ultrabeat Filter and Distortion Section
The output signals of both oscillators, the ring modulator, and the noise generator are
passed on to Ultrabeats central Filter section (if not bypassed with the various signal flow
buttons). The Filter section offers a multimode filter and a distortion unit.
267Chapter 11 Ultrabeat