The flexibility of a matrix mixer is far superior to a standard mixer, the possibility to route any input to any single or multiple outputs allow for very complex chains, combining parallel and series processing while easily reconfigurable without any extra patching.

Features

• All Inputs Left channels are normalled to the Right Inputs.
• Blank areas on the left and bottom edges of the panel allow for the user to write all the inputs and outputs sources that each channel is connected to.
• Different coloured knobs for faster visual recall-ing: Black for A,C,E Outputs; Dark Red for B,D,F Outputs.
• Cream knobs for potential feedback diagonal: 1A, 2B, 3C, 4D, 5E, 6F.
• DC coupled circuitry, can be used to mix both audio or cv signals.
• Jumpers on the back of both modules allow the user to set each channel independently to Line or Synth Level, making it easier to integrate with external sources, sound processors or guitar pedals.

Specifications

• Width: 25hp + 8hp (33hp total)
• Depth: 45mm
• Power: +12V 140mA / -12V 140mA

Manufacturer product page here.
Product manual here.

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The module is provided with a standard melodica pipe which connects to an air filter (providing a receptacle for condensation to form and isolate the sensor) and lastly connects to the module front panel.

The signal captured by the sensor is then sent to two independent sections with exactly the same functions as seen in the signal flow diagram below.

As an example the two sections can be used with different settings to independently control the VCA and VCF of any standard analog voice patch.

PIPE
We’re using a standard Melodica pipe into an air filter that will keep condensation away from the sensor. The air filter is then connected to the front panel sensor input using a silicone tube.

SENSOR CALIBRATION
[RESPONSE] is the main control to calibrate the pressure curve, the knob goes from exponential to logarithmic with linear at 12 o’clock. Exponential will be more reactive to high pressures, logarithmic to lower pressures.

HOLD FUNCTION
This feature allows to hold the current voltage value with the hold is engaged (button led on), the state can be changed either by the push button in a latching manner (push to change state) or via the gate input in a momentary manner (hold on while gate is on)

Specifications

• Width: 10hp
• Depth: 45mm
• Power: +12v 70mA / -12v 40mA

Manufacturer product page here.
Product manual here.

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Four channels with stereo input and gain knob. Fifth channel with stereo input without gain knob, which are the preferred inputs to cascade several ADDAC813s when more channels are needed. Master Output controls the level of the Inputs mix. Two LEDs monitor the inputs mix.

Mono Send / Return return path allows for easy integration of mono effects in a stereo chain. Plug your favorite module through it (filter, bbd delay, spring reverb…) or any mono pedal.

The Return Gain works in parallel with the Master Output, just like regular wet / dry controls.
The send output can be configured to be line or synth level via a jumper in the back.

Stereo output sums the Inputs Mix with the Return signal.
The Mono output is the sum of Left and Right outputs

Effect Pedals
Using the send output at Line level, the user can connect the send output directly into mono effect pedals and have the pedals output connected directly into the return input without the need of an attenuator/amplifier module.

Specifications

• Width: 8hp
• Depth: 40mm
• Power: +12v 50mA / -12v 50mA

Manufacturer product page here.

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EURORACK ±12V POWER RAILS
Although we all refer to Eurorack PSU voltages as +12V and -12V this is hardly ever the case, although most systems operate at close proximity to this ideal reference, there are situations where the drop from the ideal voltage is large enough to influence the performance of your system.

PSU CURRENT RATINGS
Running a PSU too close to its limits will always cause more stress to the PSU, a good practice it to use only about 75% of your PSU maximum ratings, this will greatly extend the PSU life.

PSU VOLTAGE DROPS
PSUs will show a small voltage drop as current increases which will drastically increase when pushed closed to its limits. Heat will also influence this drop, heat is related to the current drawn, as more current is being drawn more heat will build up on the PSU, heat conditions will reduce the maximum amount of current that can be delivered by the PSU. While the current consumption drop is somewhat stable and immediate (as you turn the frame on the current consumption will stabilize in a few seconds) the heat drop will take some time to occur, heat will build up over time until it stabilizes and only if it has “headroom” to stabilize. If heat dissipation is not effective then the drop will continue until it reaches a balance point which can be several volts below our 12V reference. At this point your PSU will be under great stress and the heat generated is prone to leave some permanent scars.

Heat will start to have an impact at about an ambient temperature of 50 degrees celsius, at 70 degrees the maximum current rating will drop by 50%. If your PSU is rated at 2A maximum and it’s running at 70 degrees then it will only be able to deliver 1A maximum. For the PSU this is a complex balancing act as current influences heat and heat influences the maximum ammount of current available which all together influences the voltage drop.

This is why it’s so important to keep the PSU load at a sensible level.

PSU PROTECTIONS
Some PSUs feature over voltage, over current and overheating protection and will turn off when the operating conditions trigger any of the protection threshold levels. At this point it’s typical that the PSU will enter a Hiccup mode, where it turns on checks the current conditions and quickly turns off if they haven’t changed, leaving it in an intermittent limbo where it powers on and off at some regular frequency.

If the conditions change enough to drop below the protection threshold levels then the PSU will automatically recover and stay on.

PSU STRESS
Different situations can be responsible for causing stress that can damage the PSU,
It’s possible to reverse a ribbon power cable enough times or leaving it connected long enough to partly damage the PSU.

Another situation is having a module that due to some partial previous damage may be drawing more current than specified which will not be accounted for when calculating your system current consumption.
Stress can cause permanent damage to the PSU, however some damages can be only partial leaving you with a PSU that no longer features the specs described by the manufacturer but with no apparent misbehaviour. The led monitors on busboards will be on but in reality it will be underperforming at an unknown percentage of the original specs. These situations can be quite hard to debug without the proper tools to evaluate the cause of the problem.

Specifications

• Width: 4hp
• Depth: 35mm
• Power: +12v 60mA / -12v 60mA

Manufacturer product page here.
Product manual here.

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BUSBOARD MONITOR
The busboard monitor leds allows the user to check the state of the busboard power lines as well as the special CV/Gate functions. If the busboard has no +5v supply the led will be off likewise for the CV/Gate functions if not in use.

This is a desktop device, we provide a long power cable so that it can still be plugged into your rack.
As a safety precaution only power this board when you need to test a cable. Leaving it ON at all times can lead to unintended problematic misuses which, in a worst case scenario, can shorten your Eurorack PSU.

! WARNING ! DO NOT POWER MODULES FROM THE TEST SOCKETS!!

Compatible with all ADDAC System ribbon cables (power, expansions and interconnectivity: 112, 213, 807).
Also compatible with any standard Eurorack power ribbon cable (2×5 to 2×8 or 2×8 to 2×8).

! WARNING !
NOT ALL MANUFACTURERS FOLLOW THESE STANDARDS!
ALWAYS NOTICE THE ORIENTATION OF THE HEADERS IF YOUR CABLE DO NOT FOLLOW THE STANDARD THEN MOST PROBABLY IS NOT COMPATIBLE.

Tech Specs:
30mA +12V
30mA -12V

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The concept is simple. It contains two identical smooth random voltage generators. Each has a frequency, level, offset and curve control. The frequency control sets a steady pace with which bipolar random voltages are generated. The level control works like an attenuator/VCA on the output, reaching from max output to closed. The offset allows shifting the whole wave up and down on the voltage range. Curve determines the shape of the interpolation.The bipolar activity on the main outputs as well as gate outputs are visualised with LEDs.

Both Frequency and Level controls have a CV input with attenuator. When there is nothing patched into the CV inputs, these are internally connected to the main output of the other channel. This normalization makes it very easy to add randomization to the frequency or level for more depth, or of course, add cross-modulation for chaotic voltages.

The output VCAs are usefull to dial in subtle and time-based modulation without the need for external VCAs. For example, to modulate the amount over time with an envelope, or use the other generator with slower speeds to add random changes to the level of a random voltage.

Both generators also have two other outputs. One is an exact inversion of the main output, so it responds to the level and CV input. This is great for stereo or inversed effect patches. The other is a simple pulse output, here there are two different behaviours, channel A outputs a pulse at every random generation, channel B acts like a comparator. Whenever the main is positive this comparator output is a high gate. And whenever the main output is negative or close to 0, there is no gate output. Great for random triggers or firing other events like envelopes.

A couple other outputs are also available and are obtained by averaging both channel main outputs. The first output is the average while the second is an inverted average.

Specifications
Width: 10hp
Depth: 45mm
Power: +70mA, -40mA
Manufacturer product page here.
Product manual here.

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Instead of using an expression pedal into the effects pedal the user can use this module in between a CV source and the Effects pedal to be controlled.
This is a great way to control the available parameters on the effects pedals straight from a CV source.

ADDAC309 features 2 channels each with a CV Input with attenuator and a 1/4″ jack output.

This is a passive module. The power needed for operation is taken from the pedal power instead of the modular frame, allowing for perfect matching of the pedal’s operating voltage, which can range from 3.3V to 9V.

Specifications

• Width: 4hp
• Depth: 35mm
• Power: Passive

Manufacturer product page here.
Product manual here.

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Finally imagine the buoys would wirelessly transmit their absolute height directly to your module outputs where they would be mapped to a voltage signal.

We use a Gerstner Wave as the motor behind the two-dimensional wave generation. In fluid dynamics a Gerstner Wave is described as “a progressive wave of permanent form on the surface of an incompressible fluid of infinite depth”. Gerstner waves are often used in computer graphics to simulate any type of water surface, if you’ve seen any animation film or computer game with water surfaces in it most probably it features a Gerstner wave generating it.

Specifications
Width: 10hp
Depth: 45mm
Power: +70mA, -40mA
Manufacturer product page here.
Product manual here.

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The incoming signal amplitude is controlled by a [GAIN] attenuverter circuit allowing to attenuate the signal as well as invert its phase. A back jumper can set the maximum gain amount to either x1 (unity gain) or x10. DIY modifications can be made by changing its resistors. After the Gain an offset can be added to the signal, displacing the signal up or down (-5V to +5V) this can be adjusted using the [OFFSET] knob and CV input.

When using no input using the [OFFSET] knob and CV input will generate an output between -5V and +5V.

Specifications

• Width: 6hp
• Depth: 25mm
• Power: +40mA / -40mA

Manufacturer product page here.
Product manual here.

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Features

• Gain knob adjusts the output’s voltage range (±10V)
• Offset adjusts initial range position (±10V)
• Smooth switch allows hard and soft smoothing of the raw sensor output.
• Positive and inverted CV Outputs
• Comparator Gate out with Threshold knob
• Module ships with electrodes. Pads are reusable and replaceable.

Specifications
Width: 4hp
Depth: 40mm
Power: 60 mA +12V, 60 mA -12V
Manufacturer product page here.

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