205
Chapter 11: Reference Section
Z-PLANE FILTER DESCRIPTIONS
F149
Lo/High4
A scattering of poles and zeros with fairly high Q settings produces this
very resonant filter. Sweeping the Morph axis produces quite pronounced
wa-wa effects in which multiple resonances are clearly audible. Morph
Offset and Frequency Tracking can be used to tune the filter, although with
Morph Offset set to 255, the filter is essentially flat.
Morph:
Positive values increase pole/zero frequencies and decrease ‘Q’,
opening the filter entirely.
Freq. Tracking:
Similar to the Morph axis, but a bit higher in pitch.
Transform 2:
Not used.
F150
SbtleMvmnt4
Morphing this filter to reverse the polarity of a series of more-or-less evenly
spaced peaks and notches produces an effect more subdued than some
types of filter sweeps. Using velocity or a mod wheel (assigned through the
Note-on Control section) to control the Morph parameter can be useful
when developing responsive plucked-string instrument sounds, such as
guitar.
Morph:
Controls polarity of poles.
Freq. Tracking:
Tunes the filter.
Transform 2:
Not used.
F151
Buzzy Pad.4
This filter produces a bump at 65Hz and a rolloff above 250Hz at low
Morph values. Increasing the Morph value pushes the bump up to about
2kHz, and the cutoff of the lowpass filter up to 20kHz. Increasing the value
of Frequency Tracking sends the bump higher yet — up to about 8400Hz at
maximum offset. The effect of sweeping the Morph axis is similar to that of
a classic 2-pole lowpass filter with medium resonance.
Morph:
Tunes the filter.
Freq. Tracking:
Tunes the filter.
Transform 2:
Not used.
F152
6.4
Lowpass cutoff is set to 400Hz with ‘0’ Morph Offset. In addition, there is a
6 dB bump at 5kHz. The bandwidth of this “bump” is controlled by the
Morph parameter. Sweeping the Morph Offset upwards moves the band-
width setting from very narrow to very wide. Frequency Tracking moves
the cutoff frequency of the lowpass filter up to a maximum of 20kHz. The
range of effects available is from fairly dramatic to quite subtle.
Morph:
Controls filter bandwidth.
Freq. Tracking:
Controls filter cutoff.
Transform 2:
Not used.
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