In the modular world a jump from a note to its equivalent an octave higher/lower equals a difference of 1V (one Volt).

For instance middle C (C4, 261.63Hz) equals 0V (no change happening to the frequency set with the large FREQ knob on the VCO) whilst C5 (523.26Hz) can be achieved by sending 1V into the V/OCT input of the VCO.

In western music, the octave is divided into 12 ‘semi-tones’.
This allows for musical scales to be played, e.g. major, minor and many others.

The ‘root’ of a scale is the note on which the scale begins. All the notes in between the root note and its octaves are achievable by sending equal fractions of 1/12 of 1V to the 1V/OCT input.

On the SEQ3 sequencer a major scale between C4 and C5 can therefore be played by only inputting the voltage values for the notes with the ‘x’.

C4 0V x
0.083V
D 0.167V x
0.249V
E 0.332V x
F 0.415V x
0.498V
G 0.581V x
0.664V
A 0.747V x
0.83V
B 0.913V x
C5 1V x