A new tier of Engineermaxxing

Reverbs

Interactive Media Engineering. A sound you hear and a curve you watch are the same signal. Here you don't read about audio — you play it, drag it, and watch the math light up. From the first oscillator to the Fourier transform that reads it.

Start with the first sound → ▢ Or just play in the Playground →

A new wing Manifold · visual geometry

Manifold · after Needham's Visual Differential Geometry

The shape of space, as an instrument

Reverbs proves audio and visuals are one signal. Manifold extends that to geometry: carry an arrow around a loop on a glowing sphere and watch the curvature turn it — honest parallel transport, light-painted as it goes, and a holonomy you can hear as a beat. Two pieces live now — a flagship lesson and the Curvature Instrument.

The vector that comes home turned → · ◍ Play the Curvature Instrument →

The path two tracks, one signal

Play track

Build intuition by ear

The Ableton on-ramp. Drag, hear, understand — no equation required yet. Each idea is a playable instrument.

How synths make sound — oscillators live
LFOs & modulation live
Envelopes — ADSR live
Filters — sculpting the spectrum live
Beats & rhythm live
Notes, scales & chords live

Signal track · Stanford ASPMA

The DSP rigor

Xavier Serra's Audio Signal Processing for Music Applications — the real math, every concept still a live, audible instrument.

Available now two deep lessons

Play track · 00

How Synths Make Sound

Tap a panel and it sings. Drag pitch, grow harmonics, sculpt loudness — the circle that sings, the additive workshop where you type Fourier recipes as code, and a playable bloom that fuses sound, math, and art. The whole synthesis chain, felt before it's named.

Signal track · Stanford ASPMA · 02

The DFT — Seeing a Spectrum

Build the Fourier transform from one question — does this frequency fit? Drag a probe and feel correlation spike, work a 4-point DFT by hand, write it in JS & Python, then play a chord and watch the math name its notes.

All 15 lessons are live — derivations, dual-language code, and a playable instrument in every one. Start anywhere; the Play track builds intuition, the Signal track builds the math.