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 fold.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 instr 1 asig poscil3 .8, 400, 1 ;very clean sine kincr line p4, p3, p5 asig fold asig, kincr outs asig, asig endin </CsInstruments> <CsScore> ;sine wave. f 1 0 16384 10 1 i 1 0 4 2 2 i 1 5 4 5 5 i 1 10 4 10 10 i 1 15 4 1 100 ; Vary the fold-over amount from 1 to 100 e </CsScore> </CsoundSynthesizer>