Play
Hear the engine. Then read how it did it.
Every instrument here runs on the same calls you will make from your own code. Each one has a 30-second goal, a few challenges worth XP, and an "under the hood" panel with the request and the response. Progress stays in your browser; no account needed.
On this site · 10
Web Audio · THIRI API
Helix Arpeggiator
A voice-leading arpeggiator with a fat synth, polyphonic harmony, FX and MIDI export.
30 seconds: Pick a progression, press play, drag the helix. Export the MIDI.
React · scroll timeline
Voice-Leading Story
Scroll through a real lattice export and watch Cmaj7 | Am7 | Dm7 | G7 lead voice by voice.
30 seconds: Scroll. Each frame is one chord; the lines are the voices moving.
Web Audio · Cymatics Physics · React
Meridian Ambient DAW
Five Claude-driven ambient agents compose healing sequences over Web Audio synthesis and Chladni cymatics.
30 seconds: Load a healing preset or toggle steps. Watch sand particles form Chladni nodal lines.
Csound WASM · THIRI API
Conductor
Type a musical direction; THIRI arranges a four-piece band and plays it in the browser.
30 seconds: Type "slow gospel in Bb, 8 bars". Press conduct. Download the MIDI.
Web Audio · pitch shifting · THIRI engine
CORIS Harmonizer
Sing or play into the mic; up to four formant-preserving harmony voices follow the chord.
30 seconds: Allow the mic, hold a note, pick a chord. Hear the stack.
Csound WASM · React
Band Studio
A 16-step drum sequencer, a chord sequencer and vocal harmony, all on one clock.
30 seconds: Press play on the default pattern, then change a chord.
Csound WASM · React
Drum Sequencer
Sixteen steps, thirty-plus synthesized drum voices, no samples.
30 seconds: Toggle a few steps and press play.
Csound WASM · React · THIRI voicings
Keys Sequencer
A chord and keys step sequencer: piano, Rhodes, organ, pad, Moog bass, voiced by THIRI.
30 seconds: Step through a progression on the Rhodes.
static JSON · client search
Csound Corpus Browser
Search a 500-instrument sample of the 5,316 Csound instruments indexed from the official FLOSS repositories.
30 seconds: Search "fm bell". Open one. Read the orchestra.
Csound WASM · React
THIRI Studio Rack
The synth rack: measured Csound instruments as modules you can audition.
30 seconds: Audition a module. Turn a knob.
On other THIRI surfaces · 4
Same engine, different front doors. These open in a new tab.
practice.thiri.ai
Practice Tools ↗
Tuner, metronome, ear trainer, drone, chord pads and an on-screen MIDI keyboard with live chord detection.
practice.thiri.ai
Solfège Trainer ↗
Sing the degree, hear whether you landed.
runthechanges.com
Run the Changes ↗
Theory you can fail at: spell the chord before the bar comes around.
composer.thiri.ai
Composer C ↗
Say a band in English; get a rendered arrangement with stems.