Waldorf Q Rack, Руководство пользователя

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Sound Parameters – Filter Types
Waldorf Q User’s Manual 90
Filter Types
This paragraph describes the Q’s different filter types. Most types are based on traditional low pass,
high pass or band pass structures.
Bypass
Use this setting to bypass the filter. This is useful if you want to disable the filter temporarily and listen
to the pure oscillators’ signals.
24dB Low Pass and 12dB Low Pass
The low pass types 24dB LP and 12dB LP are suitable for the most usual applications. Use the 24dB
slope if you want to create sounds with a typical audible filtered character, use the 12dB slope if you
want to get softer results.
Frequency
Level
Cutoff
24dB/Oct 12dB/Oct
Picture 27: Low Pass Filter Type
PPG LP Lowpass
The PPG LP is a resonance lowpass filter with a slope rate of 24dB per octave. Its characteristics were
modeled after the legendary PPG Wave synthesizer and its integrated SSM 2044 chip. The resonance
of the SSM 2044 had a very special tonal character, which has not been implemented in this way in
any other filter circuit or IC. If you have the chance to directly compare the original with the Q, you
will find the resonance (or Emphasis, as it´s called in the PPG) of both to be nearly identical.
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When using the PPG LP Filter type Filter FM isn´t possible. The cause is that the original filter
circuit also didn´t have FM.
24dB Band Pass and 12dB Band Pass
The band pass filters 24dB BP and 12dB BP remove frequencies both below and above the cutoff
point. As a result, the sound character gets narrow. Use these filter types for programming effect and
percussion-like sounds.