Soliton

What is Soliton?

Soliton is a feedback delay and texture engine where every repeat reshapes itself. Eight allpass dispersion stages spread the wave on each pass through the loop, controlled by the Spread knob. Saturation refocuses it through the Focus knob. A dynamic stabilizer holds the amplitude steady.

The result is a delay line that neither decays into silence nor runs away into feedback. Repeats can hold their amplitude indefinitely while their character evolves on every recirculation, built from the Korteweg-de Vries equation that describes the wave of translation John Scott Russell first observed in 1834.

What's the mechanism?

The KdV equation describes solitary waves: pulses that propagate through a nonlinear dispersive medium and preserve their shape against the forces that would normally smear or attenuate them. Soliton implements that balance directly inside a feedback delay loop.

Dispersion spreads the spectrum on each pass through the loop, the same way a dispersive medium spreads a real wave. A waveshaper inside the loop refocuses the signal, bringing the spread energy back into a coherent pulse. A dynamic amplitude stabilizer adjusts feedback gain on every cycle so the line neither decays into silence nor runs away into self-oscillation.

The equilibrium between dispersion, refocusing, and stabilization is what lets the delay sustain at a fixed amplitude while continuing to change in character.

How do you use it?

Soliton has five primary parameters: Time sets the delay length; Spread sets the magnitude of the dispersion stages; Focus sets the refocusing strength of the in-loop saturator; Sustain sets the target amplitude the stabilizer holds; and Tone shapes the high-frequency response of the loop.

Four shaper modes give different evolution arcs as the wave recirculates: Warm Tanh, Asymmetric Tape, Glass Sine, and Metal Fold. They range from gentle harmonic warmth, through tape-style asymmetric drive, through glassy upper-harmonic structure, into hard-clip metallic saturation.

Pulse introduces optional rhythmic gating tied to the host BPM for drum-bus and percussion work. Ping-Pong mode and Freeze are also provided.

Where does it fit?

Soliton works as an infinite-sustain ambient generator, an evolving rhythmic delay, a saturator with depth, and a stabilizer for feedback patches that would otherwise self-destruct.

Set Sustain high and Spread wide for sustained ambience. Use Pulse with host-synced Time for rhythmic material. Set Time short and Wet high for saturation and texture. Use Freeze to capture a moment and hold it as a playable layer.

The mechanism is balance, not effect: every parameter is a knob on the equilibrium between forces that already exist in the equation.

Soliton can be programmed into a project or played as a performance instrument.

Learn more at chiral.audio/soliton.