# The Cubic Module Transforms its input signal by offsetting, scaling, squaring, and cubing it.

Cubic calculates the function:

• y = ax3 + bx2 + cx1 + dx0

which (because x1 = x and x0 = 1) can be written as:

• y = ax3 + bx2 + cx + d

Take care when applying Cubic to an audio signal.

WARNING: Cubic can emit voltages far outside the safe audio range (-5 to 5V). See the usage guide for details.

WARNING: The x2 and x0 knobs can generate a very large DC bias. See the usage guide for details.

# Controls

• IN: The gain to apply to the IN signal to produce the value of x for the equation. The range is 0 to 2.

• x3: The amount of x cubed to add to y — the a coefficient for the ax3 term of the equation. The range is -2 to 2.

• x2: The amount of x squared to add to y — the b coefficient for the bx2 term of the equation. The range is -2 to 2.

• x1: The amount of x to add to y — the c coefficient for the cx1 term of the equation. This acts as a attenuverter with a range of -2 to 2.

• x0: The constant to add to y — the d coefficient for the dx0 term of the equation. This acts as a DC offset with a range of -10 to 10V.

• OUT: The gain to apply to y before sending it to the OUT port. The range is 0 to 2.

# Ports

• IN: The input signal to transform.

• OUT: The transformed signal.

• CV: A control voltage signal to modulate the associated parameter.

# Using Cubic

• Cubic excels at transforming a simple modulation signal, such as a sawtooth or triangle wave, into something more interesting.
• To generate a constant voltage, adjust x0 and leave all other controls at 0. The range is -10V to 10V (which you can amplify using the OUT gain).
• To use Cubic as an attenuverter, adjust x1 and leave all other controls at 0. The range is -2 to 2 (which you can further amplify using the OUT gain).
• By default, all of Cubic’s controls are set to 0. While this makes the default patch essentially useless, it does make it easier to set any control to 0.
• WARNING: Cubic can generate voltages far outside the safe audio range of -5 to 5V. If you apply Cubic to an audio signal, adjust the IN and OUT gain to keep the output signal in the safe audio range.
• WARNING: The x2 and x0 controls can generate a signficant DC bias. If you apply x2 and x0 to an audio signal, adjust the IN and OUT gain to keep the output signal in the safe audio range (-5 to 5V). The x2 and x0 controls can each, to some extent, compensate for the DC bias generated by the other.