Chapter 11: Reference Section 183
Z-PLANE FILTER DESCRIPTIONS
F051 4 PoleLoQ.4
A resonant low-pass filter emulation. Morphing creates the famil-
iar filter sweep effect.
Morph: Controls filter cutoff.
Freq. Tracking: Controls filter resonance.
Transform 2: Not used.
F052 4PoleMidQ.4
A 4-filter version of the classic 4-pole resonant filter found in most
analog synthesizers.
Morph: Controls filter cutoff.
Freq. Tracking: Controls resonance (“Q”).
Transform 2: Not used.
F053 2p>4p 0
Morph: Opens up the filter making it brighter.
Freq. Tracking: This adds a small amount of resonance (Q) to the
filter.
Transform 2: Changes from a 4-pole filter (-24dB/oct.) to a 2-pole
filter (-12dB/oct.).
Comments: This All Pole filter is modeled on traditional lowpass
filter. It has a soft resonance boost.
F054 LowPassPlus
Morph: Sweeps from octave peaks starting at 220Hz to
inharmonic, higher frequency peaks.
Freq. Tracking: Keyboard tracking.
Transform 2: Brightens the response.
F055 Low Past.4
Poles with fairly high ‘Q’ settings are grouped into the lower- to
upper-midrange. Sweeping along the Morph or Frequency Track-
ing axes can produce some rather vocal-sounding effects.
Morph: Use to sweep the frequencies of the pole.
Freq. Tracking: Use to tune the filter.
Transform 2: Not used.
F056 APass.4
Simple lowpass filter with gentle rolloff above 200Hz; morphs to
flat.
Morph: Gentle lowpass to flat response.
Freq. Tracking: Also moves the filter towards a flat response,
allowing you to control the depth of filtering
Transform 2: Not used.
Comments: A good choice when more subtle filtering is desired.
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