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 event.wav -W ;;; for file output any platform </CsOptions> <CsInstruments> ; Required settings for WebAudio: sr = 48000 ksmps = 128 nchnls = 2 nchnls_i = 1 ; Initialize the global variables. ; sr = 44100 ; kr = 4410 ; ksmps = 10 ; nchnls = 1 ; Instrument #1 - an oscillator with a high note. instr 1 ; Create a trigger and set its initial value to 1. ktrigger init 1 ; If the trigger is equal to 0, continue playing. ; If not, schedule another event. if (ktrigger == 0) goto contin ; kscoreop="i", an i-statement. ; kinsnum=2, play Instrument #2. ; kwhen=1, start at 1 second. ; kdur=0.5, play for a half-second. event "i", 2, 1, 0.5 ; Make sure the event isn't triggered again. ktrigger = 0 contin: a1 oscils 10000, 440, 1 out a1 endin ; Instrument #2 - an oscillator with a low note. instr 2 a1 oscils 10000, 220, 1 out a1 endin </CsInstruments> <CsScore> ; Make sure the score plays for two seconds. f 0 2 ; Play Instrument #1 for a half-second. i 1 0 0.5 e </CsScore> </CsoundSynthesizer>