This should play if your Web browser has WebAssembly enabled (most do). Most examples will play unless they need to load files. The first time you click Play, Csound will spend a few seconds loading, then play. You can edit this code and replay it.
<CsoundSynthesizer> <CsOptions> ; Select audio/midi flags here according to platform ; Audio out Audio in No messages -odac -iadc -d ;;;RT audio I/O ; For Non-realtime ouput leave only the line below: ; -o vco2.wav -W ;;; for file output any platform </CsOptions> <CsInstruments> ; Required settings for WebAudio: sr = 48000 ksmps = 128 nchnls = 2 nchnls_i = 1 ; sr = 44100 ; ksmps = 10 ; nchnls = 1 ; user defined waveform -1: trapezoid wave with default parameters (can be ; accessed at ftables starting from 10000) itmp ftgen 1, 0, 16384, 7, 0, 2048, 1, 4096, 1, 4096, -1, 4096, -1, 2048, 0 ift vco2init -1, 10000, 0, 0, 0, 1 ; user defined waveform -2: fixed table size (4096), number of partials ; multiplier is 1.02 (~238 tables) itmp ftgen 2, 0, 16384, 7, 1, 4095, 1, 1, -1, 4095, -1, 1, 0, 8192, 0 ift vco2init -2, ift, 1.02, 4096, 4096, 2 instr 1 kcps expon p4, p3, p5 ; instr 1: basic vco2 example a1 vco2 12000, kcps ; (sawtooth wave with default out a1 ; parameters) endin instr 2 kcps expon p4, p3, p5 ; instr 2: kpw linseg 0.1, p3/2, 0.9, p3/2, 0.1 ; PWM example a1 vco2 10000, kcps, 2, kpw out a1 endin instr 3 kcps expon p4, p3, p5 ; instr 3: vco2 with user a1 vco2 14000, kcps, 14 ; defined waveform (-1) aenv linseg 1, p3 - 0.1, 1, 0.1, 0 ; de-click envelope out a1 * aenv endin instr 4 kcps expon p4, p3, p5 ; instr 4: vco2ft example, kfn vco2ft kcps, -2, 0.25 ; with user defined waveform a1 oscilikt 12000, kcps, kfn ; (-2), and sr/4 bandwidth out a1 endin </CsInstruments> <CsScore> i 1 0 3 20 2000 i 2 4 2 200 400 i 3 7 3 400 20 i 4 11 2 100 200 f 0 14 e </CsScore> </CsoundSynthesizer>