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 ;;;RT audio out ;-iadc ;;;uncomment -iadc if RT audio input is needed too ; For Non-realtime ouput leave only the line below: ; -o cent.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 ; original pitch iroot = 440 ; root note = A (440 Hz) print iroot ;print out asig oscili 0.6, iroot, 1 outs asig, asig endin instr 2 iroot = 440 ; root note = A (440 Hz) icents = p4 ; change root note by 300 and 1200 cents ifactor = cent(icents) ; calculate new note inew = iroot * ifactor print iroot ; Print all print ifactor print inew asig oscili 0.6, inew, 1 outs asig, asig endin </CsInstruments> <CsScore> ; sine wave f1 0 32768 10 1 i 1 0 2 ;no change i 2 2.5 2 300 ;note = C above A i 2 5 2 1200 ;1 octave higher e </CsScore> </CsoundSynthesizer>