The warp knobs
15
affect the ripples’
uniformity during the wave’s fundamen-
tal period. In the middle position, the
density of the ripple is constant (if not
modulated by the ratio parameter).
Turning this up bends the wave so that
the density is higher at the beginning of
the period and gradually decreases to-
wards the value set with the ratio knob
as it decays (fig. 3a). Turning the warp
knob CCW from the middle bends the
wave in the opposite direction: the den-
sity is decreased at the beginning of the
period and gradually rises to the value
set with ratio at the end of the decay
(fig. 3b). The warp parameter can also
be modulated with bipolar CV plugged
into the corresponding jacks
16
.
The two miniature switches for each
element, ratio track
17
and damp
track
18
, allow one to choose wheth-
er or not the density of the ripples and
the decay rate are proportional to the
length of the fundamental period. In oth-
er words, they allow switching between
constant spectrum of the elements (not
tracking the pitch) and constant overall
waveform shape (tracking the pitch).
The shape switches
19
select between a
sine-like and square-like waveform for
each element. The square wave’s richer
spectrum offers a more aggressive sound
of that particular signal component.
Sofia has several signal outputs. The
main out jack
20
contains the final mix
of the fundamental wave and ripple ele-
ments as defined by the mixing controls.
The fundamental tone (a pure sinusoid,
not affected by the saturation) is avail-
able at the fund out jack
21
. The two in-
dividual element a and b out jacks
22
6
1
0.5
0
-0.5
-1
0 2000 4000 6000 8000 10000
Amplitude (V)
Time (μs)
0.8
0.6
0.4
0.2
0
-0.2
-0.4
-0.6
-0.8
0 2000 4000 6000 8000 10000
Amplitude (V)
Time (μs)
fig. 3a: effect of the warp knob turned cw
fig. 3b: effect of the warp knob turned ccw