Correlation Modulation

Use left/right phase correlation as a modulation source.

This is a Max For Live device that uses a stereo signal's left/right phase correlation as a modulation source to control other parameters. It has adjustable smoothing, shift, and scale controls.

A mono signal has a correlation value of 1. A stereo signal that is perfectly out of phase has a correlation value of 0. A , as does a signal at 100% volume in one channel and silence in the other. This device allows you to map that correlation value to up to 8 other parameters in your Live Set.

Video showing it in action.

Changelog

Direct download links below.

• 2024-10-29 v3 - Add non-blocking telemetry ping on load. Does not send any identifying information, only the plugin name, the local computer name, type of computer, and CPU type. I just want to see which plugins are used the most.

• 2024-08-17 v2 - Support Live 12 Modulation mode; General improvements and UI touch-ups
• 2023-12-09 v1 - Initial Version

Installation / Setup

If you just want to download and install the device, then go to the frozen/ directory and download the newest .amxd file there. You can also download it directly via the links in Changelog.

Note: If you want to open and edit the non-frozen device, you will need to have zs.mapper installed. Follow the installation instructions there.

Usage

Add the device to an instrument or MIDI track. The left/right phase correlation of the incoming stereo audio signal is calculated, smoothed, scaled and shifted. The resulting signal can be used to modulate other parameters in your device chains.

Smooth

Use the Smooth dial to control how many samples are averaged to produce the output value. A higher number will produce smoother output. You can control the smoothing by time or with a note value.

Curve

Adjusts the power of the curve mapping to the output values. Higher numbers have exaggerated responses to changes in correlation.

Scale

Scales the output value by the specified value.

Invert

Inverts the output signal.

Shift

Increases or decreases the output value by a fixed amount.

Common Problems

...

...

TODOs

• ...