E-Mu Ultraproteus Operation Manual page 207

Z-PLANE FILTER DESCRIPTIONS
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F045 BrickWaLP2
Morph: Controls filter 'Q'.
Freq. Tracking: Controls filter cutoff.
Transform 2: Use to control filter depth.
F046 MdQ 2PoleLP
A single pole of this filter is swept from low to high as the filter is Morphed.
This filter produces nice, not-too-resonant sweep effects.
Morph: Controls filter cutoff.
Freq. Tracking: Controls filter cutoff.
Transform 2: Controls resonance.
F047 HiQ 2PoleLP
A more resonant version of filter 050, with a single frequency band being
swept about according to Morph.
Morph: Controls filter cutoff.
Freq. Tracking: Controls filter cutoff.
Transform 2: Controls resonance .
F048 MdQ 4PoleLP
Similar to filters 050 and 051, in this filter two of the poles (tuned to the
same frequency) are swept to create a steeper rolloff at the cutoff point, re-
creating the classic 4-pole lowpass filter effect. This filter features medium
resonance which can be accentuated via the Transform 2 offset.
Morph: Controls filter cutoff.
Freq. Tracking: Controls filter cutoff.
Transform 2: Controls resonance.
F049 HiQ 4PoleLP
Again, (as with filters 050-052), two poles tuned to the same frequency are
swept to create a steep rolloff at the filter cutoff point. This filter features
high 'Q', which can be controlled via Transform 2.
Morph: Controls filter cutoff.
Freq. Tracking: Controls filter cutoff.
Transform 2: Controls resonance.
F050 2poleLoQLP4
This is basically a 2-pole lowpass filter which can be swept from 60Hz to
19.5kHz. Modulating the Frequency Tracking parameter upward will
increase filter resonance. A good choice for emulating certain kinds of
analog filter effects.
Morph: Controls filter cutoff.
Freq. Tracking: Controls resonance.
Transform 2: Not used.
UltraProteus Operation Manual