SUB OUT
1V/OCT PWM IN SYNC IN TRI OUT
OUT
AUDIO IN FM IN
+1 OCT
-1 OCT
COLOUR
PLS OUT
WAVE
TUNE
DETUNE
PU
LSE
WIDT
H
SUB
LEVEL
FM LEVEL
TU
BE CRUNCH
FUSION VCO2
This is the main
output of the VCO
This is dedicated
suboscillator
output
THANK YOU FOR ORDERING
ERICA FUSION VCO2!
The Erica Synths Fusion series modules
are designed combining vacuum
tubes and semiconductors therefore
they bring warm, powerful sound and
overdrive possibilities of vacuum tubes
into your modular system. Erica Fusion
series consist of range of modules
used in sound shaping circuit – VCO,
Mixer, real Ringmodulator using
audio transformers and germanium
diode ring, VCF, VCA, Analogue Delay/
Flanger, Palsma Drive and others. Also
Erica Fusion System is available.
Fusion VCO2
is full analogue sound
source with lots of distinct features.
The core of the module is highly
stable AS3340-based VCO with three
simultaneously available waveforms,
transistor-based suboscillator and
detune function – two BBD delay lines
that make frequency shifter that is
mixed back to the principal oscillator
in order to emulate two detuned
VCOs. Tube crunch – distinct tube
overdrive - is added on the top of the
mix. Furthermore, Audio input mixes an
external audio signal with the principal
oscillator which results in crazy sonic
experience. Fusion VCO2 is exactly what
you need, if you wish to go really low
frequencies and have a sound that sets
your modular system apart
from mass!
This is octave switch
– depending on the
setting it will transpose
the VCO one octave up
or one octave down
This is logarithmic FM
CV input. Adjust the
attenuator for desired
FM level
This is an external
audio input. It mixes
the external audio
signal with the oscillator
and the suboscillator
and feeds it into tube
overdrive circuit
This is manual tune
knob – it will adjust tune
of the VCO
over 2 octaves
This is FM attenuator
– adjust it to achieve
anything from nice
vibrato to extreme FM
madness
Adjust pulse width
manually! PWM
CV is added to the
potentiometer setting
Detune emulates two
detuned VCOs. Two BBD
delay lines that make
frequency shifter that is
mixed back to the principal
oscillator. Turning the
knob CW increases detune
amount and the internal
LFO frequency and in
extreme CW setting you get
crazy frequency beats
Adjust the transistor based
suboscillator level! Full CW
setting will provide max
suboscillator presence
The resulting signal
of the VCO+suboscillator
+frequency shifter
is passed through two tube
overdrive circuits for ultimate
crunchiness of the sound
This is the
suboscillator Colour
switch – essentially
lowpass filter. Select
the suboscillator
timbre to your taste
Select the waveform of the
VCO that is assigned to the
main output
This is dedicated Pulse
wave output
This is dedicated
Triangle wave
output
This is 1V/oct input.
The VCO tracks great
over 8 octaves and
more
This is Sync input.
Besides regular VCO
synchronization, we
implemented unique
suboscillator sync
circuit
This is Pulse Width
Modulation CV input.
The CV is added to
the Pulse Width knob
ERICA FUSION VCO2
