Pro 2 CV Output Explained

The Pro 2 is extremely flexible when it comes to Control Voltages, and it can be configured to properly interact with virtually all Eurorack modules.

The Pro 2's CV outputs have a range of 0 to 10v. Since the range is 0-10v, Middle C is sent from the CV output at 5v. This allows the CV out to track over a 10 octave range, from 0 to 10v.

There is no standard input voltage range for Eurorack modules. Some modules/external synths have a 10v input range, while others have a 5v input range. Using the "DC Offset" parameter in the Modulation Matrix, you can configure the Pro 2 as necessary to work correctly with your specific module.

You can also assign the keyboard/sequencer of the Pro 2 to transmit CV data at 1v/octave by assigning "note number" to modulate "CV out (1-4)" with an "Amount" of "127" in the Mod Matrix.

For example:

If the Pro 2 sends CV at 1v/octave to an oscillator that has a maximum input range of 5v, sending Middle C from the Pro 2 will result in the oscillator playing at its highest frequency.

There are a couple ways to correct for this offset. First, you could use an external attenuator. Or, by applying a negative DC offset to the CV output via the Modulation Matrix the Pro 2 can compensate for the voltage difference completely internally. Here's how you would configure the Pro 2 to control an external oscillator which has a 5v input range from the Mod Matrix:

Mod Slot 1: Note Number --> 127 --> CV out 1 (This will set the CV output to scale at 1v/octave when a note is played)

Mod Slot 2: DC --> -64 --> CV out 1 (The DC offset of -64 will apply a -5v offset to the CV)

The external oscillator with a 5v range in our example will now track at the same octave as the Pro 2's internal oscillators. 

You can adjust the DC offset for other maximum voltages as well.

In general: 

DC offset value of -16 would equal a -1.25v offset to the CV output 
DC offset value of -32 would equal a -2.5v offset to the CV output
DC offset value of -48 would equal a -3.75v offset to the CV output
And so on...

You can also make incremental adjustments to the DC offset to fit your specific application.

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