Bitwig Math Modulator - Combine, Quantize, and Process Modulation

Bitwig Guide | Jul 01, 2022

The math modulator allows you to combine two modulation sources using various mathematical operations like multiply, add, subtract, minimum, maximum, and quantize, providing flexible ways to shape your modulation signals. You can control each input with knobs or modulate them further with sources like macros or LFOs, and the quantize option lets you set the resolution of your modulation in discrete steps. This tool is especially useful when you want to creatively process or combine modulation signals for unique sound design possibilities.

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Short Overview #

I use the math modulator to combine and reshape modulation signals in creative ways, simply by selecting operations like add, multiply, subtract, minimum, maximum, or quantize. By dialing in values or applying modulation to each input, I can blend or shape signals exactly as I want, whether it's smoothly mixing, stepping, or limiting them depending on the context. This flexibility lets me design modulations that enhance movement and control, and while I might not need it every time, it’s a great tool for pushing my sound design further whenever I want to experiment or solve a specific modulation challenge.

• The math modulator processes two input signals with individual knobs and supports multiple mathematical operations: multiply, add, subtract, minimum, maximum, and quantize.
• Each knob (A and B) can be manually adjusted or modulated with other sources, such as macro knobs or LFOs.
• Multiply operation outputs the product of the two modulation values.
• Add operation sums the two modulation values, combining their ranges.
• Subtract operation deducts one modulation value from the other.
• Minimum and maximum operations output the smallest or largest value between the two modulators, respectively.
• Quantize operation steps the output modulation into a defined number of equal-sized increments based on the B knob's setting.
• The quantization resolution can be controlled, dividing the modulation range into 2 to 20 steps.
• The modulator can be used with macro knobs, LFOs, or random modulators for creative, step-based, or conditional modulation effects.
• Useful for specific scenarios where mathematical relationships between modulations are needed, though not always essential in every workflow.

Introduction to the Math Modulator #

In this overview, I will explain how the math modulator works, its interface, and its functionalities. The math modulator is a tool that allows you to combine and process two modulation signals in various mathematical ways, making it more versatile for controlling parameters in your sound design workflow.

Basic Operation and Interface #

The math modulator receives two different input signals via two separate knobs: one on the left (labeled A) and one on the right (labeled B). Each knob can be assigned its own modulation source, such as macro controls, LFOs, or other modulators. You also have a dropdown menu to choose from multiple mathematical operations, including multiply, addition, subtraction, minimum, maximum, and quantize. The outgoing signal is then available via the modulator’s output handle, which you can route to parameters like cutoff, resonance, or any other target.

Overview of Mathematical Operations #

Here’s a more in-depth look at each operation available in the math modulator:

Multiply #

When using the multiply function, the modulator outputs the product of the values from A and B. For instance, if both A and B are modulated to their maximum (100%), the output is the maximum possible value. This is useful for creating exponential modulation effects or scaling one modulation signal by another.

Add and Subtract #

With the add function, the output is the sum of A and B. For example, if both knobs are at 50%, the output will be 100%. Subtract does exactly what it implies: the value of B is subtracted from A, or vice versa, depending on the direction set. This can invert or offset modulation in creative ways.

Minimum and Maximum #

Selecting minimum outputs the smallest value between A and B at any given moment, while maximum outputs the largest. These operations are helpful when you want your modulation to be constrained by one of the sources, or to only allow the strongest or weakest signal to modulate a parameter.

Quantize #

The quantize operation is particularly noteworthy. It divides the modulation range into a set number of steps, determined by the B knob. At maximum (100%), the range is divided into 20 steps; at 50%, into 10 steps; and at 10%, into 2 steps, and so forth. This creates a stair-stepped, or “quantized,” modulation output instead of a smooth glide. This is useful for effects where you want modulation to jump between discrete values, like sample-and-hold or stepped filtering.

Example Workflows #

To demonstrate these functions, you can assign macro knobs or LFOs to A and B. For instance, assigning an LFO to A and a random modulator to B, then setting the operation to maximum, will output the highest value from either source. Applying this output to a filter cutoff will result in dynamic, often unpredictable modulation, which can be especially useful for experimental sound design.

When quantizing, modulating a parameter with A while adjusting B lets you control the “resolution” or number of steps in the output. This method is also effective when you want your modulation to snap to specific values rather than move smoothly.

Creative Applications and Use Cases #

While you might not need complex math operations for every patch, the math modulator opens up new possibilities when you want to combine or process modulations in precise ways. Its selection of operations lets you shape modulation signals, constrain them, or create new, more intricate modulation patterns. For example, combining different LFOs with minimum or maximum can add subtle or extreme movement to parameters, while quantize can yield electronic, arcade-like effects.

Summary #

The math modulator acts as a versatile utility for processing two modulation sources with various mathematical operations. By multiplying, adding, subtracting, selecting min or max, or quantizing modulation values, you can craft unique movement and behavior in your sound design. Assigning any modulation source to either input and selecting the appropriate operation allows for creative, flexible modulation schemes, with practical applications ranging from subtle control tweaks to wild, stepped, or unpredictable effects.

Full Video Transcription #

This is what im talking about in this video. The text is transcribed by Whisper, so it might not be perfect. If you find any mistakes, please let me know.
You can also click on the timestamps to jump to the right part of the video, which should be helpful.