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CubuSynth VCFA - Build Guide

PCB V1.2 Sept 2022

Step 15 - Knobs

Place the knobs on the Potentiometers. For best results, turn all Potentiometers counter-

clockwise and push on the knobs, so the marking points towards the left end of the surrounding

circle.

Step 16 - Trimming

Before your module is finished, you need to callibrate the trimmer on the back.

Please note, that this is a filter and not a VCO, so 1V/oct tracking will not be the most precise.

But it will be quite stable over at least 2 octaves.

First plug in the 16pin Eurorack Power cable correctly to your Busboard and the Module while

your rack is powered OFF! Make sure orientation is correct. (Red stripe to the -12V side).

Then turn on your case, and plug the LP to the output of your rack. (speakers / headphones).

To adjust the V/oct tuning, set the resonance to 100%, then plug a Keyboard/Sequencer or MIDI-

interface, that produces 1V/oct signals to the Freq CV input (set the Freq CV knob to 100%) and

the Gate to the Input of the VCFA. This allows the resonance to "ping" at given Frequency.

Play the lowest C on the keyboard and tune the big Frequency to play a C. Then press the C1 on

your keyboard (one octave higher) and adjust the trimmer (without detuning on the Front) so

the tuning is exactly note C, one octave higher. Repeat those steps until the VCO always plays a

C when you play a C on the keyboard, and up to 2 or 3 octaves higher.

If you prefer, you can also let a sequencer play through the octaves in 2-3 steps (C1, C2, C3...)

and turn the trimmer, until the tuner always shows the same note in different octaves.

If you don't have a tuning device, but a frequency counter (e.g. oscilloscope), you can tune down

to exactly 100hz, the next octave should always double the frequency to 200hz, then 400hz,

800hz, 1600hz and so on.

Congratulations, you can now install the module in your rack and have fun patching!

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