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 -odac ;;;realtime audio out ;-iadc ;;;uncomment -iadc if realtime audio input is needed too ; For Non-realtime ouput leave only the line below: ; -o dumpk-2.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 = 32 ; nchnls = 2 0dbfs = 1 giSine ftgen 0, 0, 2^10, 10, 1 instr 1 ;writes a control signal to a file kfreq randh 100, 1, 2, 1, 500 ;generates one random number between 400 and 600 per second dumpk kfreq, "dumpk.txt", 8, 1 ;writes the control signal printk 1, kfreq ;prints it endin instr 2 ;reads the file written by instr 1 kfreq readk "dumpk.txt", 8, 1 printk 1, kfreq ;prints it aout poscil .2, kfreq, giSine outs aout, aout endin </CsInstruments> <CsScore> i 1 0 5 i 2 5 5 e </CsScore> </CsoundSynthesizer>