Attack
Waldorf
19
Operation Manual
point is emphasized. The following picture shows the effect of the resonance parameter
on the filter’s frequency curve:
Frequency
Level
Cutoff
Resonance
Low pass filter resonance
If the resonance is raised to a great enough extent, then the filter will begin self-
oscillation, i.e. the filter generates an audible sine wave even when it does not receive
an incoming signal.
Beside the low pass filter, the Attack offers the following filter types:
Type (Filter Types)
The following filter types are available when selected with the mouse:
12 dB Low Pass Filter. Use this type if you want to create sounds with a ty-
pical audible filtered character; for example, bass or lead sounds. With a low
pass filter you can shape bass drums or snare drums.
12 dB Hi Pass Filter. This type is useful to thin out a sound’s bass frequen-
cies. This may also give interesting results in conjunction with cutoff frequen-
cy modulation. By doing this you can "fly-in" a sound, starting with its high
harmonics and then coming up to its full frequency range. You can cut the
bass and mid range of high frequency drum sounds like hi-hats or crashes.
12 dB Band Pass Filter. This type removes frequencies both below and a-
bove the cutoff point. As a result, the sound character gets thinner. Use these
filter types when programming effect and percussion-like sounds.
12 dB Notch Filter. This type is the opposite of the band pass type. It dam-
pens frequencies around the cutoff point. Frequencies below or above the
cutoff point are passed through. Use this filter type for programming effect
sounds. Resonance has no great influence because it raises the frequencies
that the notch filter dampens. You can hear a little effect of phase changes, but
not to any great degree.
EQ Lo- or Hi- Shelf Filter: Unlike a normal synthesiser filter, this filter type
works like an equalizer. When the resonance parameter is set below 50%, the
filter works as Hi Shelf, raising high frequencies up to 12 db. Values over 50%
cause the filter to work as Lo Shelf. Now, deep frequencies can be raised up to
12db. The Cutoff knob sets the center frequency of the Shelf EQ.
Summary of Contents for Attack
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