E-Mu MORPHEUS User Manual

Chapter 7: Preset Programming 91
PRESET PROGRAMMING
Suppose we added yet another dimension to the filter model. We
could have the realtime Morph parameter, the Frequency Tracking
parameter (set at note-on time) and one more parameter, perhaps
controlling the amount of the filter peaks with key velocity. A way to
visualize a three-dimensional filter model is shown by the diagram
below.
••• Note: The Frequency
Tracking parameter is
Transform 1.
••• If the frequency graphs
at the corners of the cube are
confusing you, think of them
as the settings on a graphic
equalizer.
Each axis of the three-dimensional cube changes the filter in a differ-
ent way. In the example above, key number is being applied to the
Frequency Tracking parameter in order to make the filter frequency
track or follow the notes played on the keyboard. Assigning the Key-
board to frequency is called Key Tracking and is used to keep the tim-
bre of the sound constant as you play up and down the keyboard.
Without key tracking the sound would get duller as you move up the
keyboard and could sound completely different at opposite ends of the
keyboard. Because Frequency Tracking is so important it has been
assigned its own parameter which is used in many of the filters (there
are exceptions).
In the filter model above, there is another note-on (defined at the time
the note is pressed) parameter, Transform 2. Unlike the Frequency
Tracking parameter, the effect of Transform 2 may vary from filter to
filter. In the example above, Transform 2 is being used to vary the size
of the peaks and notches in the filter. The frequency plots in the
upper plane of the cube have sharper peaks. Key velocity could be
used to control Transform 2 and the sharpness of the filter peaks.
The Cube filters are actually constructed of eight different complex filters.
Key Number
Frequency Tracking
Transform 2
Velocity
Morph
Morph
Transform 2
Transform 2
Morph
Transform 2
Real-Time
Morph
Frequency Tracking
Frequency Tracking
Frequency Tracking

E-Mu MORPHEUS Specifications

General

Brand	E-Mu
Model	MORPHEUS
Category	Synthesizer
Language	English