Applied Acoustics Systems Chromaphone 3 Upgrade Acoustic Object Synthesizer Plug-In (Download) - Manual (Page 34)

34 The Editor View
leftmost position and 100 % in their rightmost position with a value of 0 % when in their center
position. This value represents the maximum possible percentage of variation of the destination
parameter, in terms of its range, around its current value. A value of 100 % therefore means that
the destination parameter can vary over its full range while a value of zero means that its value
will remain fixed. Negative values are used to invert the direction of the variation, in other words
decrease the value of the destination parameter when a positive modulation signal is received and
vice versa for negative modulation signals.
At the top of each macro module is an Amount knob which controls the amount of modulation
applied to the destination parameters associated with the macro. These controls are gain knobs
which behave exactly in the same way as those on the
Home view and described in Chapter 2.3.1.
The range of these knobs vary from -1 in their leftmost position to 1 in their rightmost position
with a value of zero in their center position. The only exception is the the
Modulation knob which
varies between 0 and 1.
The actual amount of modulation applied to a destination parameter is determined by the mul-
tiplication of the value of the Amount knob and that corresponding to the range of the destination
parameter. Since the value of the Amount knob varies between -1 and 1, it can be interpreted as a
fraction of the allowed range of the destination parameter. When set to a value of 1, the amount of
modulation applied to the destination parameter will be equal to value set by the range parameter,
when set to 0.5 it will be equal to half the value allowed by the range knob, with a value of zero
the modulation will be nil and the value of destination parameter will remain unchanged. The ef-
fect is the same for negative values but the modulation of the value of the destination parameter is
inverted. Note that the value of the
Amount know associated with the Modulation macro can only
be positive because it is assumed that a vibrato or amplitude modulation effect can only be added
to a sound.
In the case where the Timbre macro is mapped to the cutoff frequency of a filter, for example,
the total amount of variation of the cutoff frequency is determined by the value of the corresponding
range knob. If set to 0.25 for example, the maximum allowed amount of variation will correspond
to a quarter of the full range of this parameter. When the Amount knob is in its zero position, the
frequency remains unchanged but it starts to increase when the knob is turned clockwise. When
the
Amount knob reaches a value of 1, the value of the cutoff frequency will have been increased
by a quarter of the parameter range, in other words a quarter of the maximum possible value for
this parameter. If the
Amount knob is set to negative values, the cutoff frequency will be reduced
in a similar manner.
A good way to adjust these parameters is to set the Amount knob to its maximum value by
turning it fully clockwise and then adjusting the value of the range knobs to get the maximum
desired amount of modulation effect. The
Amount knob is then set back to its zero position.
Note that there is a relationship between the Amount knobs of the Macro modules and those on
the Home view. The amount of modulation signal applied to a destination parameter corresponds
to the sum of the values specified by these two knobs. As the modulation knobs on the Home
view can be assigned to external MIDI controllers, the total amount of modulation signal is in
fact equal to the sum of the values of these two knobs plus that associated with the value sent by