E-Mu Ultraproteus Operation Manual page 200

F004 CubeFlanger
A flanging filter featuring deep notches tuned in octaves and a steep roll-off
of high frequencies when all axes have no offset. High settings for Trans-
form 2 can produce some rather metallic-sounding overtones. Apart from
flanging effects, this filter can be used in much the same way as a standard
resonant synth filter.
Morph: Tunes the filter notches.
Freq. Tracking: Controls lowpass filter cutoff point.
Transform 2: Increases resonance and introduces some peaks.
F005 Flange3.4
Notches are spaced at a ratio of 1.61 between notch frequencies, starting at
40Hz. This spacing means that notches will not fall on top of all of the
harmonics of a sound at once. Instead, they should hit harmonics one at a
time as they are swept in frequency. Traditional flangers have notches
spaced linearly, not log spaced.
Morph: Moves all of the notches up above 10kHz, with the relative
frequency spacing decreasing. The deepest flange effect will happen in
the lower 1/3 to 1/5 of the morph parameter range.
Freq. Tracking: Sets the initial tuning of the notches, moving all of the
notches up from 40Hz to 325Hz as the base frequency.
Transform 2: Not used.
F006 Flange 4.4
A highly resonant flanger /filter type. Sweeping the Morph axis produces
dramatic effects. The Filter Frequency Track parameter can be used to tune
the flanger; higher values produce more open sounds.
Morph: Increase to raise the cutoff frequency and vary the gain of the
various peaks and notches.
Freq. Tracking: Tunes the filter.
Transform 2: Not used.
F007 Flange 5
A complex flange possessing some vocal-sounding characteristics. Sweep-
ing along the Morph or Freq. Track axes produce flanger-like effects.
Morph: Tunes the notches.
Freq. Tracking: Spreads the notches.
Transform 2: Increase this to move the filter toward a more flat curve.
F008 Flange 6.4
Introduces both peaks and notches which start widely spaced and become
more tightly distributed as Morph Offset reaches maximum. The center
frequencies for the various filter bands move towards higher ranges as the
Morph or Filter Freq. Track parameters are swept upward; the effect is not
unlike a sweeping of multiple resonant band-pass filters.
Z-PLANE FILTER DESCRIPTIONS
Chapter 11: Reference Section 179