Intellijel Linix User manual

Linix Manual v1.00

Linix

Six Channel Voltage Controlled Amplifier / Five Channel Mixer

Linix Manual v1.00

Table of Contents

Table of Contents

Overview

Features

Installation

Before Your Start

Installing Your Module

Front Panel

Controls

Inputs and Outputs

Instructions

Technical Specifications

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Linix Manual v1.00

Overview

Linix is the successor to the now discontinued HexVCA module. It comprises six high quality

linear VCA circuits with CV attenuation and BIAS control for each channel. The first five

channels normal to a summing amp that feeds the input of sixth channel. This allows you to

have voltage control of the master sum. Patching into an individual output channel breaks that

channel from the master sum. If the direct output is used for each channel then the sixth

channel becomes an additional independent VCA as well (Hex VCA). Each channel has an LED

to monitor incoming CV activity.

The SUM output has an additional set of LEDs to monitor the bipolar state of the final sum and a

clip led to monitor the absolute max signal level.

There is a 12pin header on the back to connect the Linix channel direct outputs to the inputs of

an Intellijel Mutamix or Mutagen module.

Features

●Manual BIAS control per VCA which is convenient when using the module as a mixer or

for biasing when CV modulating the VCA with a bipolar LFO.

●Dedicated CV attenuators with LEDs for monitoring CV signals.

●Channel six provides a sum of all input signals and CV inputs.

●Using individual outputs removes a channel from the sum.

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Linix Manual v1.00

Installation

Intellijel Eurorack modules are designed to be used with a Eurorack-compatible case and power

supply.

Before Your Start

Before installing a new module in your case you must ensure your case’s power supply has

sufficient available capacity to power the module:

● Sum up the specified +12V current draw for all modules, including the new one. Do the

same for the -12 V and +5V current draw. The current draw will be specified in the

manufacturer's technical specifications for each module.

● Compare each of the sums to specifications for your case’s power supply.

● Only proceed with installation if none of the values exceeds the power supply’s

specifications. Otherwise you must remove modules to free up capacity or upgrade your

power supply.

You will also need to ensure you have enough free space (hp)  as well as free power headers in

your case to fit the new module.

You can use a tool like ModularGrid to assist in your planning. Failure to adequately power your

modules may result in damage to your modules or power supply. If you are unsure, please

contact us before proceeding.

Installing Your Module

When installing or removing a module from your case always turn off the power to the case and

disconnect the power cable. Failure to do so may result in serious injury or equipment damage.

Ensure the 10-pin connector on the power cable is connected correctly to the module before

proceeding. The red stripe on the cable must line up with the -12V pins on the module’s power

connector. The pins are indicated with the label -12V, a white stripe next to the connector, the

words “red stripe”, or some combination of those indicators.

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Most modules will come with the cable already connected but it is good to double check the

orientation. Be aware that some modules may have headers that serve other purposes so

ensure the cable is connected to the right one.

The other end of the cable, with a 16-pin connector, connects to the power bus board of your

Eurorack case. Ensure the red stripe on the cable lines up with the -12V pins on the bus board.

On Intellijel power supplies the pins are labelled with the label “-12V” and a thick white stripe:

If you are using another manufacturer’s power supply, check their documentation for

instructions.

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Once connected, the cabling between the module and power supply should resemble the

picture below:

Before reconnecting power and turning on your modular system, double check that the ribbon

cable is fully seated on both ends and that all the pins are correctly aligned. If the pins are

misaligned in any direction or the ribbon is backwards you can cause damage to your module,

power supply, or other modules.

After you have confirmed all the connections, you can reconnect the power cable and turn on

your modular system. You should immediately check that all your modules have powered on

and are functioning correctly. If you notice any anomalies, turn your system off right away and

check your cabling again for mistakes.

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Front Panel

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Controls

1. BIAS 1-5 - Sets the base level, or bias, of a channel’s VCA. When fully clockwise this

approximately equivalent to applying a +5 V voltage at the CV input resulting in unity

(1:1) gain. The knob level is summed with the channel’s CV input.

2. BIAS SUM  - Sets the base level of channel 6, or the sum of all channels with no

connection to their OUT jacks.

3. CV Attenuators - Controls the amount of CV sent to control a channel’s level

Inputs and Outputs

A. CV 1-5 - The CV input for controlling the level of a channel. A +5 V input with the

channel’s attenuator fully clockwise and BIAS control fully counterclockwise results in

approximately unity (1:1) gain.

B. CV SUM - The CV input for controlling the level of all summed channels. Connecting a

channel’s OUT removes it from the SUM and if all channels are removed, the SUM

channel can be used as a sixth VCA.

C. IN 1-5 - The input to a channel.

D. IN SUM - This inputs a signal into the summed mix. Since the BIAS SUM knob controls

the level of the summed mix, this will only control the input of this channel relative to the

summed mix. If the OUT of each channel is connected, this input will function like any

other channel with the BIAS knob controlling the base level of channel 6.

E. OUT 1-5 - The signal output for a channel.

F. SUM - The signal output for the summed mix of all channels without a connection to their

OUT jack.



 

Page 7

Linix Manual v1.00

Instructions

Six Independent VCAs

The simplest way to use the Linix is to ignore any of the summing CV and mixing functionality

and just use it as up to six independent VCAs:

● Connect the output signal from the source to IN 1. The source can be anything, any

oscillator, LFO, envelope, or any other audio or CV generator.

● Connect OUT 1 to the input of the destination.

● Connect a modulating signal to CV 1. The modulating signal can also be anything but is

typically the output of an envelope generator or LFO. Interesting effects can be had

when using audio-rate sources like oscillators.

● Turn BIAS 1 fully counterclockwise to remove any CV bias.

● Adjust the CV input attenuator and Linear / Exponential Response control to taste.

You can repeat the above instructions for all other channels to get six totally separate VCAs.

Level Bias

The BIAS control of each channel can be used to bias, or set a base level for the channel’s

response. In this way you can set the “default” amount of signal passing through the VCA, and

then adjust it using external CV. One situation where this is useful is when controlling amounts

of modulation. For example when the output of one oscillator is being connected to the FM input

of another, the Linix can be used to vary the FM amount:

● Connect the sine output of oscillator 1 (the modulator) to IN 1 of the Linix.

● Connect OUT 1 of the Linix to the FM input of oscillator 2 (the carrier).

● Use BIAS 1 to set the FM amount (index).

● Connect an envelope to CV 1 and adjust the attenuator. The envelope can now be used

to vary the FM index during each note played.

Summed Mixing

The inputs of the Linix have a summing feature, allowing it to be used as a mixer:

● Connect up to five sources to IN 1 through IN 5.

● Take the output from the SUM jack.

Page 8

Linix Manual v1.00

● LEVEL 1 through LEVEL 5 control the mix levels.

● You do not need to connect anything to CV 1 through CV SUM if you are using the

module as a manually controlled mixer, but they can be used to automate the mix on one

or more channels, or to control the level of the overall mix with CV SUM.

These various methods of using the Linix can be combined. You can use summed mixing on

channels 1-4 and then use channel 5 as an independent VCA by using its output to remove it

from the SUM mix, and many other combinations. This is why the Linix is more versatile than

your average VCA!

Rear Jumpers

LINK - This header on the back of the module allows the connection of a Mutamix using a

12-pin ribbon cable. Connecting the two modules normals the outputs of the Linix to the inputs

of the Mutamix. Connecting cables to the Linix outputs will not break this normalling. However,

connecting signals to the Mutamix inputs will break this normalling. This can be useful for

splitting a signal, for example to create a wet/dry mix. Note that because the Linix sums its

inputs to channel six, Mutamix will in turn receive the sum of all Linix signals on channel six.

Page 9

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