cre8audio Function Junction User manual

Function Junction is a trademark of Cre8audio LLC. Copyright © Cre8audio LLC. 2022
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FuNCTioN
v1.0
User
Guide
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Function Junction is a modulation hub combining four independent sections into
a single intertwined module that offers much more than the sum of it’s parts.
Although a sum of it’s parts is one of it’s best features!
Three classic analog modulation sources, ADSR envelope, function generator,
and LFO are fed into an attenuverting mixer to create a complex modulation
junction. A simple idea supported by a very deep set of tools.
Each section can be patched by itself. This is important for the whole “four
independent sections” thing to work. The ADSR, function generator, LFO, and
mixer never need to interact. The mixer is perfectly happy to mix external signals
instead of the modulation sources. Each section uses switched jacks to normal
internal connections. These internal connections can easily be patched over to
create custom signal paths.
I am sure I have made Function Junction sound more complicated than it is so
let’s dig in and look at each section one at a time.
Four Plus More All n One!
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Envelope Generator (ADSR) Overview
The ADSR section is a four stage envelope generator that smooths the shape of
incoming trigger or gate signals to produce more expressive control voltages. The
ADSR output can be used to control the amplitude of an oscillator, the cutoff
frequency of a lter or any other function on a module that accepts control
voltages.
The incoming gate or trigger signal passes through each of the four stages to
output an envelope. When the ADSR module receives a gate or trigger signal, the
attack determines the amount of time needed for the envelope generator to
reach the peak output voltage and move on to the decay stage. Decay sets the
amount of time needed to transition to the level set by the sustain knob. The
sustain level is maintained as long as the incoming gate remains on or high. Once
the incoming gate goes low or off, the release knob sets the time needed to
close the envelope and return the ADSR output to 0 volts.
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ADSR Envelope (1 of 2)
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Envelope Generator (ADSR) Controls
ATTACK KNOB - Envelope attack control knob.
DECAY KNOB - Envelope decay control knob.
SUSTAIN KNOB - Envelope sustain control knob.
RELEASE KNOB - Envelope release control knob.
A IN JACK - Envelope input gate jack.
A OUT JACK - Envelope output jack.
LONG BUTTON - Extends the length of the attack, decay, and release times.
Envelope Generator Looping
LOOP BUTTON - Enable/disable envelope cycling. The SUSTAIN KNOB and RELEASE
KNOB are used to adjust the time it takes to loop.
A LOOP JACK - Enable/disable loop mode. An external gate signal will ip the
state of the loop mode. If loop mode is on, the gate will turn loop mode off. If
loop mode is off, the external gate will turn loop mode on.
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ADSR Envelope (2 of 2)
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Function Generator Overview
A true multi-function utility section, the Function Generator can be utilized in
many different ways to t the needs of a patch. The Function Generator can be
used as an envelope generator, a voltage controlled LFO, a slew generator, a
gate signal delay, envelope follower, a clock source, voltage controlled clock
divider, complex modulation source, and more...
Function Generator (1 of 4)
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Function Generator Controls
ATTACK KNOB - Attack duration control knob.
DECAY KNOB - Decay duration control knob.
CURVE KNOB - Attack and decay response curve. Exponential (full left), Linear (12
o’clock), Logarithmic (full right)
MOD KNOB - Modulation input (F MOD JACK) attenuverter knob.
MOD BUTTON - Assign Modulation input (F MOD JACK) to attack, decay, or both.
LOOP BUTTON - Enable/Disable loop mode.
LOOP BUTTON (2nd FUNCTION) - Press and hold MOD BUTTON then press LOOP
BUTTON to assign A LOOP JACK destination to ADSR or function generator.
SUSTAIN BUTTON - Enable/Disable sustain mode.
F IN JACK - Function Generator trigger/gate input gate jack.
F MOD JACK - Function Generator modulation input jack.
F OUT JACK - Function Generator output jack.
F TRIG JACK - Function Generator end of decay trigger output jack. A trigger is
output at the end of the decay stage.
Function Generator (2 of 4)
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Duration and Shape
The Function Generator is a variable modulation source outputting between 0
and +5v. The shape of the output is created using two main controls, ATTACK
KNOB and DECAY KNOB. The ATTACK KNOB sets the amount of time the function
generator takes to reach 5v and the FALL KNOB sets the amount of time the
function generator takes to return to 0v. These controls determine both the
duration and shape of the function generator. A short attack with a long decay
creates a saw like wave. Matched attack and decay times will generate a
triangle.
Response Modes
The function generator will respond to an incoming gate or CV signal differently
based on the selected mode. There are 3 modes to choose from.
1. Sustain Mode
Sustain Mode allows the function generator to act as an attack, sustain, release
envelope, a slew generator, or an envelope follower. A gate or CV signal
patched into the F IN JACK initiates the attack stage. Once the function
generator has reached the end of the attack stage, the output is sustained as
long as the gate signal patched into the F IN JACK remains high. The decay stage
is triggered once the incoming gate or CV signal drops to 0v. The envelope
generated in sustain mode can be retriggered at anytime during the attack,
sustain, or decay stages.
2. Trigger Mode
Trigger Mode (or Sustain Mode Off) can be used to create a two stage attack,
decay envelope, gate signal delay or clock divider. The internal circuitry
responds differently than sustain mode when triggered. The attack stage of
trigger mode is triggered with a gate or trigger signal patched into the F IN JACK
over 2 volts. Some CV signals may trigger the function generator as long as the
waveform has a sharp enough rising slope. In trigger mode, the function
generator will not retrigger during the attack stage, however the envelope will
retrigger during the decay mode. This quirk allows the function generator to work
as a clock divider by adjusting the attack stage to skip over or miss a set number
of incoming gate signals.
Function Generator (3 of 4)
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Loop Mode
Loop Mode is an extension of trigger mode and utilizes all the same feature set.
To create the loop, the function generator uses the end of decay trigger (F TRIG
JACK) created at the end of the cycle to retrigger the attack creating a voltage
controllable low frequency oscillator and clock source.
Response Curve
The CURVE KNOB determines the linearity of the attack and decay stages from
exponential through linear to logarithmic. Turning the CURVE KNOB full left creates
a exponential response. At 12 o’clock the response is linear. Turning the CURVE
KNOB beyond 12 o’clock creates an logarithmic response.
Voltage Controlled Attack and Decay Times
Voltage control over the attack time, decay time, and both attack and decay
times is available. A CV signal can be patched to the F MOD JACK. This signal is
passed through the MOD KNOB.
The MOD KNOB is an attenuverter. That means the incoming signal is off when the
trimmer is set to the 12 o’clock position. Turning the attenuverter to the right
passes the original signal through. Turning the attenuverter to the left passes an
inverted version of the original signal through. Locating the exact off position of
an attenuverter can be difcult. The easiest way to remove the CV signal from
the signal path is to simply remove the patch cable patched into the F MOD
JACK or deselect attack and decay using the MOD BUTTON.
The MOD BUTTON sets the attenuverted modulation destination. The modulation
destination can be set to attack, decay, both attack and decay, or off.
Function Generator (4 of 4)
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LFO Overview
The LFO section is a utility low frequency oscillator with triangle and square wave
outputs. Perfect for long sweeps or audio rate frequency modulation. Simple but
effective.
LFO Controls
RATE KNOB - Frequency control knob.
L TRI JACK - Triangle wave output jack.
L SQR JACK - Square wave output jack.
Low Frequency Oscillator (LFO)
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Multi-Function Mixer Overview
The mixer section is an ambidextrous three channel attenuverting mixer for both audio and
CV signals. Internally the inputs are normaled to the outputs of the ADSR (1A), function
generator (2F), and LFO (3L) but these connections can be replaced with any external
audio or CV signal by patching into the mixer input jacks (1A, 2F, 3L). The signal path is
extremely versatile allowing it to work in multiple congurations.
Multi-Function Mixer Controls
OUTPUT 1 KNOB - Channel 1 input (1A JACK) attenuverter knob.
OUTPUT 2 KNOB - Channel 2 input (2F JACK) attenuverter knob.
OUTPUT 3 KNOB - Channel 3 input (3L JACK) attenuverter knob.
1A JACK - Channel 1 input jack. Normaled to ADSR output.
2F JACK - Channel 2 input jack. Normaled to function generator output.
3L JACK - Channel 3 input jack. Normaled to LFO output.
+OR JACK - Analog logic output jack.
1 OUT JACK - Channel 1 breakout output.
2 OUT JACK - Channel 2 breakout output.
MIX JACK - Mixer output.
Multi-Function Mixer (1 of 2)
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Attenuverter
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Three Channel Mixer
Each channel is able to mix inverted or non-inverted versions of the incoming signal. The
sum of channels 1, 2, and 3 are passed to the MIX JACK output.
The + OR JACK compares the voltage level of the three mixer inputs and passes the
voltage of channel with the highest voltage. This typically creates a chaotic, semi-random
voltage source.
Three ndependent Attenuverters
Channels 1-3 work as independent audio or CV signal attenuverters. Patch out of the 1
OUT JACK to remove channel 1 from the MIX JACK output. Patch out of the 2 OUT JACK to
remove channel 2 from the MIX JACK output. If 1 OUT JACK and 2 OUT JACK are used, the
MIX JACK is channel 3 only.
If 1 OUT JACK and 2 OUT JACK are used, the + OR JACK works as a half wave rectier for
channel 3 cutting off the negative portion of the waveform.
One Attenuverter and a Two Channel Mixer
Channel 1 or 2 can be used as an independent attenuverter with the remaining channels
working as a two channel mixer.
The + OR JACK compares the voltage level of the two remaining mixer inputs and passes
the voltage of channel with the highest voltage.
Multi-Function Mixer (2 of 2)
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Attenuverter
Knobs
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Warranty:
Cre8audio warrants to the original purchaser that this unit is free of defects in materials
and workmanship under normal use and maintenance for a period of one (1) year from
the date of original purchase. The warranty applies only to registered Cre8audio users that
register their Cre8audio Product(s) within fourteen (14) days of time of original purchase. To
register Cre8audio Products, visit Cre8audio.com. If the unit fails within the one (1) year
period, it will be repaired, or replaced, at Cre8audio’s option, at no charge, when
returned prepaid to the Cre8audio Technical Service Center with proof of purchase – the
sales receipt may be used for this purpose. Installation labor is not covered under this
warranty.
Cre8audio reserves the right to change the method by which Cre8audio may provide
warranty service, and any Cre8audio Product’s eligibility to receive a particular method of
service. Service will be limited to the options available in the country where service is
requested. Service options, parts availability and response times may vary according to
country. The original purchaser will be responsible for all shipping and handling charges.
Customers that seek service in a country that is not the country of purchase must comply
with all applicable import and export laws and regulations and be responsible for all
custom duties, V.A.T. and other associated taxes and charges. For international service,
Cre8audio may repair or replace Cre8audio Products and parts with comparable
Cre8audio Products and parts that comply with local standards.
All replacement parts, whether new or re-manufactured, assume as their warranty period
for only the remaining time of this warranty. This warranty does not apply to damage
caused by improper use, accident, abuse, improper voltage service, re, ood, lightning,
or other acts of God, or if the product was altered or repaired by anyone other than
Cre8audio Technical Service Center. Consequential and incidental damages are not
recoverable under this warranty.
Some regions do not allow the exclusion or limitation of incidental or consequential
damages, so the above limitation or exclusion may not apply. This warranty gives you
specic legal rights, and you may also have other rights, which vary by state and country
No portion of this warranty may be copied or duplicated without the expressed written
permission of Cre8audio. THIS WARRANTY IS NOT TRANSFERABLE.
Service and Contact nformation:
Please contact us for service or other information related to the Function Junction or any
other Cre8audio product. https://www.cre8audio.com/supportticket
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