The Ultraproteus Filter - E-Mu Ultraproteus Operation Manual

The UltraProteus Filter

This is what a lot of you have been waiting for. This incredible filter is what puts
the Ultra in UltraProteus. If you have not read the section on the Z-Plane
Filter in the Preset Programming section, please do so before proceeding,
since it contains important background information. Now we can add the
Z-Plane filter to our block diagram.
Instrument
Tone
Sample
Pitch
Start
Function
Gen.
Let's examine the filter controls more closely. The vertical arrows in the dia-
gram below, indicate controls that can be modulated. The Morph Offset is the
only filter control that can be modulated continuously by a Realtime Control
source.
Filter
Level
The filter has an input level control called the Filter Level which controls how
much signal is presented to the filter. This control (like most of the controls in
UltraProteus) has an initial amount and can also be controlled from a note-on
modulation source. Certain UltraProteus filters are designed to distort the
signal as a musical effect. The Filter Level allows you to control the amount of
distortion produced by these special filter types.
The action of the Morph Offset varies from filter to filter. Because it can be
continuously varied, it can be thought of as the main filter control. See the
section on UltraProteus Filters in the Reference Section of this manual for
specific information on each filter.
The Frequency Tracking control changes the frequency of the filter on many of
the filter types. This would correspond to Fc or the cutoff frequency of a tradi-
tional lowpass filter, You can connect the keyboard to this control (in the note-
on Control screen) with an amount setting of "64" if you want the filter
frequency to track the keyboard.
Z-Plane Filter
Freq Trans
Morph
Trk 2
Aux.
Velocity
DAHDSR
Key
Position
Filter Type
Reverse
Morph Freq. Transform
Offset Track 2
DCA
Pan
Volume
Volume
Possible
AHDSR
Modulation
Sources
Chapter 10: Step-by-Step
STEP-BY-STEP
R
L
FREQUENCY TRACKING DOES
NOT ALWAYS CONTROL
FREQUENCY AS THE NAME
WOULD IMPLY. SEE THE Z-PLANE
FILTER DESCRIPTIONS IN THE
REFERENCE SECTION FOR
DETAILS ON EACH FILTER TYPE.
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