Rev. 5 – Jun 2020 Page 28 of 91
The Quadrature switch enables the quadrature mode
when moved to the right. Quadrature is a peculiar function
which allows to chain the stages of both generators to ob-
tain more complex functions. You may want to think as
a couple of envelopes whose stages are inter-depending.
Here is the sequence:
· begin of cycle → yellow starts to rise;
· yellow rise ends → green start to rise/yellow in hold;
· green rise ends → yellow start to fall/green in hold;
· yellow fall ends → green start to fall/yellow in rest;
· green fall ends → end of cycle.
To achieve quadrature, move the Quadrature switch to
the right, and set the green generator in Hold mode. You
may now achieve three kinds of results, basing on the yel-
low generator’s mode in use:
Yellow in Loop: a looping quadrature, which automati-
cally restarts from the yellow rise stage when the green
ends its fall;
Figure 24: Quadrature mode with the same yellow and green times.
Figure 25: Quadrature mode with different yellow and green times.
Yellow in Transient: a single shot quadrature cycle;
Figure 26: FALISTRI’s Quadrature, yellow generator in Transient mode.
Yellow in Hold: a single shot quadrature cycle, whose
yellow hold stage depends from both green rise time and
the length of the impulse/gate used to trigger the yellow
generator.
As described in the Green Retrig section (§2.3.1), the
quadrature mode deactivates the retrig mode On Rest for
the green generator.
2.5.2 Max
The Max section outputs the higher value between the
two attenuverted signals (also called Analog OR in some
synthesizers). It is particularly useful to combine the yel-
low and green function in order to achieve more complex
envelopes or unconventional wave shapes.
2.5.2.1 ADSR
With Quadrature enabled it is possible to obtain enve-
lopes such as ADSR (Attack-Decay-Sustain-Re-
lease)/AHDSR (Attack-Hold-Decay-Sustain-Release) by
using the Max output (E.1) and the attenuverters (A.7) to set
the relative levels.
The Attack is performed by the yellow Rise.
The Hold time, when needed, is determined by both the
green Rise time and the yellow Hold time (when the yellow
generator is in Hold mode).
When the yellow Fall starts, the green generator enters
in Hold mode until the yellow envelope reaches its end.
The green Hold level is set by its Attenuverter (A.7).
As long as the yellow Fall level is higher than the green
Hold one, the envelope will be in its Decay stage. When the
green Hold stage level is higher than the yellow Fall, the
envelope will be in its Sustain stage, whose duration is set
by the yellow Fall time.
When the yellow Fall reaches its end, the envelope be-
gins its Release stage, which is set by the green Fall time.
Figure 27: AHDSR envelope with FALISTRI’s Quadrature.
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