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These controls define the liquid your bubbles exist within and the physical space they resonate inside. Together they shape the fundamental tonal character of FOAM.

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Material Presets

The Material dropdown provides scientifically-accurate liquid presets. Each one sets density, surface tension, and viscosity to real measured values.

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Manual Liquid Controls

When Material is set to “Custom” you have direct control. (These knobs are visible in all modes; selecting a preset overwrites them.)

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Resonator

The Resonator dropdown applies a physical-space body resonance to all bubbles passing through it — as if the entire foam were happening inside a glass jar, a metal pipe, a cave, or your skull. Each preset is a multi-mode bandpass filter modeled on the real physics of that space.
In Melodic and Harmonic Flow Types, the resonator’s pitch tracks the lowest active MIDI note — turning the body resonance into a tunable instrument rather than a fixed character.
The Resonance amount knob is included in Chaos modulation, so right-click to lock it if you want a stable resonance while everything else moves.