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 -odac -iadc ;;;RT audio I/O ; For Non-realtime ouput leave only the line below: ; -o printks.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 = 44100 ; ksmps = 1 ; nchnls = 1 ; Instrument #1. instr 1 ; Change a value linearly from 0 to 100, ; over the period defined by p3. kup line 0, p3, 100 ; Change a value linearly from 30 to 10, ; over the period defined by p3. kdown line 30, p3, 10 ; Print the value of kup and kdown, once per second. printks "kup = %f, kdown = %f\\n", 1, kup, kdown endin </CsInstruments> <CsScore> ; Play Instrument #1 for 5 seconds. i 1 0 5 e </CsScore> </CsoundSynthesizer>