DSP Bench
Signal processing you can hear. Wire blocks into a patch. The engine runs them sample by sample and you hear the result. A sine into a delay is an echo. A biquad with too much Q rings. A vocoder on speech and a carrier is the classic robot voice.
Every idea is something you can hear
Listen plays your patch in real time, so what you see and what you hear always agree. Turn up the Q and hear the ring. Drop the sample rate and hear the alias fold back. Headphones recommended.
See what you hear
Probe any wire and watch it on a multi-channel scope, a spectrum and a spectrogram. The harmonics of a plucked string, the skirt of a filter and the smear of window leakage are all right there on screen.
From a 440 Hz tone to a vocoder
You start by probing a single tone. Sixty-six exercises later you have:
- Fought aliasing and heard why a sample rate is a promise.
- Designed filters: biquads, a three-band EQ, window leakage on a spectrum.
- Built effects: echo, chorus, a compressor and a full pedal board.
- Made sound from nothing: FM synthesis and a Karplus-Strong string.
- Taken signals apart: a vocoder and an AM radio demodulated in the box.
It teaches first, then grades the patch
Each level opens with a brief: why the idea matters, the one formula, the one listening cue. The Learn page goes deeper with a worked patch. Then goals are measured on the live graph, and some levels run more than one test signal so a lucky answer does not pass.
Free to start
The first five exercises are free, plus five previews from later chapters: an echo, a three-band EQ, a chorus, a plucked string and a vocoder. One in-app purchase unlocks the full course for good. No subscription, no ads, no account.
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