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Labyrinth’s voice begins with two analog Voltage-Controlled Oscillators (VCOs): a sine wave VCO,
and a lower-frequency triangle-wave MOD VCO. These low-harmonic oscillators can frequency-
modulate each other for complex analog FM tones and are ring-modulated for further broadband tone
generation. The two VCOs, their RING modulation, and a variable-tone NOISE generator are mixed in a
saturating mixer, adding harmonics and warm saturation to the four signal sources.
From here, the MIXER output takes two separate paths:
the Voltage-Controlled Wavefolder (VCW) path and the
subtractive Voltage-Controlled Filter (VCF) path. The
VCW path amplifies a signal to the point of distortion, but
instead of clipping the signal folds it over on itself, creating
a wide range of upper harmonics. The manual VCW BIAS
control shifts the DC oset in the wavefolder, changing the
symmetry of the wavefolding and emphasizing even or odd
harmonics.
The VCF path features a 2-pole state-variable filter which
has voltage control over the VCF CUTOFF frequency and
manual control of its RESONANCE. There is also manual
control over the FILTER TYPE, morphing from a lowpass
(LP) filter to a bandpass (BP) filter for either precise tonal
shaping or resonant subtractive filter sweeps.
BLEND and ORDER control how these two parallel voice
paths are brought back together. With ORDER set to
PARALLEL, each path (VCW and VCF) is processed
independently and combined via the BLEND control, which
is a voltage-controlled crossfader. You can jump between
these parallel paths using CV from the sequencer, use one
of the two Envelope Generators to slide between additive
and subtractive paths over time, or modulate BLEND with
the MOD VCO for dense tones.
The ORDER switch will rearrange and intermingle these paths: set to VCW VCF, the output of the
VCW will be fed into the VCF, so that you will blend between the VCW signal on one side and the VCW
signal fed through the VCF on the other side. Setting ORDER to VCF VCW inverts this, sending the
output of the VCF through the VCW path so that you blend between the VCF signal fed through the
VCW on one side and the VCF signal on the other. Each path, VCW and VCF, has its own Voltage-
Controlled Amplifier (VCA) which is controlled by Envelope Generator 2 (EG2)—a decay-only envelope
with manual control over the decay time.
PARALLEL VOICES
SIGNALDISTORTIONFOLDING
WAVE FOLDING
ORDER SWITCH
PARALLEL
VCW VCF
VCWVCF
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