Rev. 5 – Jun 2020 Page 14 of 91
SAPÈL
Figure 14: SAPÈL interface.
A Clocks
A.1 Clock Input
A.2 Clock Rate
A.3 Single/Both Switch
A.4 Main Clock Output
A.5 Random Clock Output
A.6 Random Clock Mode
A.7 Gate/CV Modulation Input
A.8 Gate/CV Modulation Switch
A.9 Sample-and-Hold (S&H) Button
B Stepped Random Voltages
B.1 S&H Output
B.2 n+1 Output
B.3 n+1 Value
B.4 n+1 Value CV Input
B.5 2ⁿ Output
B.6 2ⁿ Value
B.7 2ⁿ Value CV Input
C Fluctuating Random Voltages
(FRV)
C.1 FRV Output
C.2 FRV Rate and Global Rate of
Change
C.3 FRV Rate and Global Rate of
Change CV Input
D Noise Outputs
D.1 Blue Noise Output
D.2 White Noise Output
D.3 Pink Noise Output
D.4 Red Noise Output
E Probability Distribution
E.1 Probability Distribution
E.2 S&H Probability Distribution
Switch
E.3 Fluctuating Probability Distribu-
tion Switch
E.4 n+1 Probability Distribution
Switch
E.5 2ⁿ Probability Distribution Switch
1 PHILOSOPHY AND DESIGN
SAPÈL is an analog generator of random control volt-
ages for Eurorack modular systems.
Its main section is composed of two identical clusters of
four Sample and Hold circuits each (yellow and green),
which generate as many different random values at the
same time.
Three of the four S&H circuits in each cluster provide
stepped random voltages: two are quantized (in “notes”)
and one is unquantized; the last S&H circuit features an
integrator to generate a fluctuating stream of random
voltages.
The three stepped voltage generators are synced, which
means that they will output three different values at the
same time. The yellow and green generators have two in-
dependent internal clocks, which can be replaced with an
external one, or temporarily overridden either via
external gate or manual button. A copy of the trig used
to sample the stepped random values is available, as well
as a random trig output.
The fluctuating voltage generator, on the other hand, is
independent and has its own potentiometer to define its
rate.
Each of the two S&H clusters samples its values from
analog noise, thus providing a “true” and completely un-
predictable randomness.
The second section of SAPÈL features four analog noise
outputs, which are derived from the analog noise used to
sample random values.
2 NOISE OUTPUTS
This section features four analog noise outputs, which
are, from top to bottom:
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