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The HexVCA contains six separate DC coupled logarithmic VCAs that have their outputs

normalled to two outputs. The front panel outputs of each VCA is a switching jack which

breaks the normal to the mix out when it is patched. This design allows the HexVCA to be used

as 6 individual VCAs, a 6 input voltage controlled mixer or any combination e.g. 2 patched

VCAs and a four input VC mixer.

At the rear of the HexVCA You will ﬁnd a six pin header that carries the outputs of the six

VCAs. This can be used to normal the outputs of the HexVCA to the Intellijel Mutagen mixer.

Front Panel

1 - VCA Offset

CV offset, also referred to as bias

knob. CV indicator LED.

2 - IN 1-6

The signal input of the VCAs.

3 - CV 1-6

The control inputs of the VCAs.

4 - Out 1-6

The output of the individual VCAs.

5 - SUM+

The output of the VCAs mixed

together.

6 - SUM-

This is the same as SUM+ except it

has inverted phase.

HexVCA Manual v1.0

Page 1 of 9

Summary of content (9 pages)

PAGE 1
HexVCA Manual v1.0 The HexVCA contains six separate DC coupled logarithmic VCAs that have their outputs normalled to two outputs. The front panel outputs of each VCA is a switching jack which breaks the normal to the mix out when it is patched. This design allows the HexVCA to be used as 6 individual VCAs, a 6 input voltage controlled mixer or any combination e.g. 2 patched VCAs and a four input VC mixer. At the rear of the HexVCA You will find a six pin header that carries the outputs of the six VCAs.
PAGE 2
HexVCA Manual v1.0 Front Panel Controls in Depth 1 - VCA offset/bias knob and CV indicator LED. The knob offsets the level of the VCA by injecting 0-5v in to the CV input. This opens the VCA and acts as an initial level control. For traditional VCA operation this knob should be left at 0 (fully counter clock wise). 2 - IN 1-6 The signal input of the VCAs. Patch audio or CV signals here to be controlled by the VCAs. In a traditional VCA patch you would patch the output of your filter here.
PAGE 3
HexVCA Manual v1.0 Rear Panel A - VCA output expander This is a twelve pin header for connecting to the Mutagen. This is the output of the six individual VCAs B - CV input trims. These trimmers are attenuators for the CV inputs. The reduce the CV level before it reaches the VCA. Because CV levels vary widely in modular synthesizers these may need to be adjusted to get optimum performance from your HexVCA. Turning the trimmer counter clock wise will reduce the CV level.
PAGE 4
HexVCA Manual v1.0 Block diagram 1 - VCA Detail In the below diagram the internal signal flow of the HexVCA is shown. This diagram is simplified to save space. Only one of the 6 VCAs is detailed. Block diagram 2 - Overview The diagram to the right shows the signal flow of the entire module. Keep in mind all of the Out jacks (shown as a hexagon) are switching jacks that break the connection to the mixer when a 3.5mm plug is inserted.
PAGE 5
HexVCA Manual v1.0 Patch Examples Example 1 - Traditional synthesizer voice In this example VCA 1 in the HexVCA is used to control the final level of a traditional synthesizer voice. The output of the VCO goes into the VCF, the out put of the VCF goes into the IN 1 of the HexVCA. Knob 1 of the HexVCA should be fully counter clock wise. The gate out of the keyboard goes into the gate in of a ADSR. The output of the ADSR goes to the CV 1 input of the HexVCA.
PAGE 6
HexVCA Manual v1.0 Patch Examples Example 2 - Tremolo effect This patch demonstrates the common effect known as tremolo. A slow LFO modulates a VCA creating a steady pulsing volume. This effect is sometimes found in old guitar amps and combo organs. In the Voice section on the left we have the traditional voice patch as seen in example 1. In the Effect section on the right of the diagram is the Tremolo effect patch. NOTE: Make sure you turn the Offset knob of HexVCA ch2 to 12 o clock.
PAGE 7
HexVCA Manual v1.0 Patch Examples Example 3 - Audio rate modulation / AM synthesis This patch can produce a wide variety of metallic, sharp and pitched noise sounds. NOTE: Make sure you turn the Offset knob of HexVCA ch1 to 12 o clock. This opens the VCA half way which is necessary when using bipolar modulation such as a VCO or LFO. The HexVCA creates sidebands by modulating the volume of a VCO 1 with VCO 2.
PAGE 8
HexVCA Manual v1.0 Patch Examples Example 4 - Voltage Controlled Mixer In this patch the HexVCA is used as a voltage controlled Mixer. Use the VCA Offset knobs on the HexVCA to set the initial level of the various inputs. The CV inputs will be added to the initial level set by the offset knobs. Positive CV will make the signal louder while negative CV will make the signal quieter. Try tuning the VCOs to different octaves and using clock dividers to trigger the ADs.
PAGE 9
HexVCA Manual v1.0 Video Manual http://vimeo.com/20822864 Follow the above link for a walk through of the HexVCA functions. Support Web:! http://intellijel.com/ email:!danjel@intellijel.