
From 7 o’clock to 12 o’clock, this probability goes from 0 (completely random) to 1 (locked loop).
At 12 o’clock, the module is thus stuck in a loop, because it never generates fresh random data. In this case,
the illuminated pushbuttons [F] and [G] blink.
From 12 o’clock to 5 o’clock, the probability of randomly jumping within the loop goes from 0 to 1.
At 5 o’clock, the module thus plays random permutations of the same set of decisions/voltages.
I. Loop length.
Lengths of 5, 7, 10 and 14 can be obtained by setting the knob between the graduations
printed on the panel.
4. DEJA VU CV input.
The X generator generates
three independent random
voltages output on
X
1
,
X
2
and
X
3
. They are
clocked by the three outputs from the
t
section, or by a common external clock.
J. Output voltage range.
0 to +2V, 0 to +5V or -5 to +5V.
K. Probability distribution
width and shape. Turning counter-clockwise from 12 o’clock, the voltages are
increasingly concentrated near the center of the range. Fully counter-clockwise, a constant voltage is
output. At 12 o’clock, they follow a bell curve - more likely to occur near the center but able to reach the
extremes. At 2 o’clock, they occupy the entire voltage range with equal probability. Past this point, extreme
values become more likely. Fully clockwise, only the minimum and maximum voltages are possible,
turning
X
1
,
X
2
and
X
3
into random gates.
L. Distribution bias.
Skews the distribution towards low or high voltages. Think of this as the probabilistic
equivalent of an offset: it does not shift the voltage down or up, but biases the decision towards the bottom
or top of the voltage range.
In the illustration below, the pink histogram represents the distribution of possible output voltages: the
tallest bar corresponds to the most likely outcome. The teal oscillogram is an example of output voltage
sequence.
M. Horizontal and vertical “steppiness”
of the generated voltages. At 12 o’clock, generates the typical
S&H steps. Turn CCW to generate smoother edges, then random linear segments, then smooth random
curves. Turn CW to quantize the generated voltages to a scale, then to progressively strip the scale of its
notes until only the root note remains.
Mutable Instruments | Marbles
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