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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 ifthen.wav -W ;;; for file output any platform </CsOptions> <CsInstruments> ; Required settings for WebAudio: sr = 48000 ksmps = 128 nchnls = 2 nchnls_i = 1 ; sr = 44100 ; kr = 4410 ; ksmps = 10 ; nchnls = 1 ; Instrument #1. instr 1 ; Get the note value from the fourth p-field. knote = p4 ; Does the user want a low note? if (knote == 0) then kcps = 220 ; Does the user want a middle note? elseif (knote == 1) then kcps = 440 ; Does the user want a high note? elseif (knote == 2) then kcps = 880 endif ; Create the note. kamp init 25000 ifn = 1 a1 oscili kamp, kcps, ifn out a1 endin </CsInstruments> <CsScore> ; Table #1, a sine wave. f 1 0 16384 10 1 ; p4: 0=low note, 1=middle note, 2=high note. ; Play Instrument #1 for one second, low note. i 1 0 1 0 ; Play Instrument #1 for one second, middle note. i 1 1 1 1 ; Play Instrument #1 for one second, high note. i 1 2 1 2 e </CsScore> </CsoundSynthesizer>