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Tracking Generator
The Tracking Generator is used to scale a modulation source. For example, normally
you could modulate the Amp (volume) of a sound using velocity; the harder you play,
the louder the sound gets. The amount of change in volume is equal to the change in
velocity; this is called linear control. If instead, however, you set the Tracking
Generator's input to "velocity", and then routed the Tracking Generator to the Amp
(using the Mod function), you can make your own customized "map" of the control
velocity has over the sound's level.
The Tracking Generator divides the range of the input into 11 points (0—10), each of
which can be set between 0 and 100. If you boost the value of one of the lower
points, you make the input more sensitive in its lower register. By creating a non-
linear curve using the velocity example above, you can scale the velocity's control
over the sound's volume just the way you want.
When selecting the Tracking Generator as a modulation source in the Mod Function,
these two choices will be available. When "TRACKGEN" is selected as the
modulation source, the Tracking Generator functions normally, scaling its input as
determined by its parameter settings.
When "STEPTRACK" is selected as a modulation source, the Tracking Generator's
output will be stepped, or interpolated. This means that instead of scaling the input
linearly from point to point, the input is kept at each point's value setting until it goes
beyond the following point's value setting, at which point it jumps to that setting. This
feature is very useful in creating "mini-sequences" if the modulation destination is set
to "Pitch" and the Tracking Generator's input is an LFO using an "Up Sawtooth" as its
waveform.
Tip: The Tracking Generator can be used to turn a variable control, such as the Mod
Wheel or velocity, into a switch by setting all of the points to 0 except for point 10.
Only near the maximum input will anything other than 0 come out of the Tracking
S4 Plus Reference Manual
LINEAR
100
0
POINTS: 0
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NON-LINEAR
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POINTS: 0
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NON-LINEAR STEPPED
100
0
POINTS: 0
1
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4
Editing Programs: Chapter 6
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