Polytope K.K have released FOAM: Physical Modeling Synth, available for $1.99.
Synthesizer design has largely revolved around familiar paradigms for decades: subtractive filters, FM frequency ratios, wavetable scans, and physical modeling of strings, pipes, or struck bars. FOAM: Physical Modeling Synth takes a radically different path by modeling a physical phenomenon rarely explored in electronic sound design: the micro-acoustics of bubbles and fluid dynamics.
Rather than relying on audio samples or traditional oscillators, FOAM generates complex sonic textures by running live physics equations for thousands of individual bubble interactions.
When a wave breaks or a liquid fizzes, the resulting texture isn’t just a handful of noise sources—it is thousands of microscopic acoustic events happening simultaneously. FOAM models 11+ distinct physical stages of a bubble’s lifecycle, simulating live events such as:
- Membrane Rupture: The initial snap as gas breaks free from liquid.
- Cavity Resonance: The pitch signature of the air pocket based on its volume and depth.
- Viscous Damping: How quickly small versus large bubbles decay depending on the fluid density.
Because every interaction is calculated in real time, altering parameters directly reshapes the underlying physical equations. Increasing viscosity causes smaller bubbles to damp instantly while larger ones ring longer in thicker liquids, mirroring real-world fluid dynamics.
FOAM scales seamlessly across sonic domains:
- Organic Textures: Delicate rain, fizzing carbonation, or rushing water streams.
- Exotic Liquids: Shift the simulation medium from water to heavy materials like glycerol, honey, or mercury to alter acoustic behavior.
- Experimental Bass & Soundscapes: Expanding bubble dimensions into fantasy scales unlocks deep sub-bass rumbles, pitch cascades, and dense walls of psychoacoustic noise.
Designed specifically for iPad, FOAM takes advantage of multi-touch control and MIDI Polyphonic Expression (MPE). Musicians can play directly on a full-screen touch surface with custom tonal layouts.
Per-note MPE mapping allows slide, pitch bend, and finger pressure to modulate bubble attributes dynamically—adjusting size, ring time, emission rates, and pitch sweeps on an individual note level.
To handle dense voice counts, the synth features a dynamic CPU governor. This lets users scale voice density up on powerful iPads or throttle it down inside complex AUM and DAW sessions.
Features include:
- Acoustic Physics Engine: Real-time physical modeling of gas-liquid interactions, modeling 11+ physical stages per bubble (rupture, resonance, collapse, decay).
- 10 Liquid Medium Types: Switchable fluid identities including water, seawater, glycerol, honey, mercury, and abstract fantasy mediums.
- Full MPE & Multi-Touch Support: Per-note expressiveness mapping pressure and slide to bubble size, pitch sweep, emission rate, and ring length.
- Touch-Surface Interface: Onscreen tonal pad layout with built-in octave shifts and multi-touch capabilities.
- Configurable CPU Governor: Adjustable voice density ceiling across multi-core CPU rendering for optimal performance in AUv3 and standalone environments.
- Deep Acoustic Parameters: Controls for Bubble Physics (rate, size, ring, cascade), Realism (shimmer, natural balance, jets, mirror depth), and Texture (stereo width, psychoacoustic intensity).
- Wide Dynamic Range: Capable of producing everything from micro-droplets and ambient textures to dense noise rafts and deep sub-bass frequencies.
- Multichannel & Surround Output: Built to support spatial audio layouts and multichannel routing.
For more information on FOAM, click here:
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