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.