Talking about the ARP 2600 voltage processor.
It looks like a really complex module but once you understand the fundamentals
its actually quite simple.
Starting at the top. The 1st voltage processor.
Lets call it VP 1
This processor acts like a mixer.
Both control signals and audio signals work equally well.
It has 4 inputs (labeled 1 to 4) and a single un named output.
There are 2 sliders which attenuate whatever is entering their jacks (2 & 4).
Jack 2 is hardwired to a -10V source.
Jack 4 is hardwired to the keyboard CV
Jack 1 & 3 don't have any attenuation sliders.
The final out-put jack is an inverter.
Thus any input signal will be inverted when it leaves VP1.
An inverter is an electronic circuit which essentially flips a waveform or
incoming voltage upside down.
Another way to describe this is that the
signal is moved 180 degrees out of phase
with the original signal.
eg:
If nothing is plugged into jack 2 & the slider is fully to the right , the voltage at
the final inverted output will be +10V
As the slider is moved to the left, the voltage at the inverted output will drop to eventually reach 0V.
This is a useful offset voltage.
The beauty of this device is that it allows you to add & mix up to 4 voltages.
These can be inputted from external modules or with what is normalled to jacks 2 & 4.
VP2
This is similar to VP 1.
Its simplier... has just 2 inputs labelled 5 & 6.
Its single output is also inverted.
Input 6 is connected to a +10V source.
Thus if the slider is fully open, the voltage measured at the output will be -10V
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If you are using VP1 to mix 4 audio inputs & you wanted a non-inverted output,
just take the inverted out of VP 1 and plug into an input of VP2 like so...
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The Voltage Processor can also be useful for boosting external trigger/gates from eurorack sequencers.
These eurorack modules often spit out +5V and are not sufficient for triggering
the 2600's envelopes which need +10V.
This is the patch:
Use it's slider to add voltage to taste..
VP 1 is just an inverter.
The Dual Atenuverter is a dual attenuverter from Barcelona-based manufacturer Befaco that will attenuate and invert the input signal and, if necessary, can also shift it (+/-10V).
This is a nice 4channel utility for all kinds of signals.
CVP
my favourite
In this short video the Turing Machine is providing +5V pulses which are being boosted
to +10V by the Voltage Processors
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The Lag Processor
Just 1 input & one output.
The input is normalised to the Envelope follower.
The lag processor has a parameter called "Lag time".
Lag is the act of slowing things down, or more specifically,
the lag processor increases the amount of time it takes for change to occur.
It's commonly used to process control signals from LFOs, envelope generators,
and the envelope follower.Another common application is portamento.
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Some modern Eurorack takes of the classic 2600 VP module.
+ Befaco
The Dual Atenuverter is a dual attenuverter from Barcelona-based manufacturer Befaco that will attenuate and invert the input signal and, if necessary, can also shift it (+/-10V).
Doepfer A 138j Inverting/Interrupting Mixer
This is a nice 4channel utility for all kinds of signals.
It will Mix, Attenuate, Invert, Offset, Mute
Channel 1 can also deliver an Offset-voltage of +/-5V when
nothing is plugged into the input.
Manhattan Analog
CVP
Level – Attenuverter, positive attenuator or inverted attenuator.
Offset – Add a stable DC offset (+/-5 V) to make
sure the modulation is in exactly the range you need it.
Glide – Slew your signal to smooth it out for filter response or portamento.
There is a two-color LED present to provide a visual display of the output signal.
Synovatron CV Tools
my favourite
Its great for adding, subtracting, attenuating, amplifying and offsetting.
It has a cascade architecture.
It is a polarizing mixer which allows an input signal’s level to be adjusted or inverted.
It also has a lag processor at the bottom.
sadly, the module is out of production.
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