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 cpstun.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 = 4410 ; ksmps = 10 ; nchnls = 1 ; Table #1, a normal 12-tone equal temperament scale. ; numgrades = 12 (twelve tones) ; interval = 2 (one octave) ; basefreq = 261.659 (Middle C) ; basekeymidi = 60 (Middle C) gitemp ftgen 1, 0, 64, -2, 12, 2, 261.659, 60, 1.00, \ 1.059, 1.122, 1.189, 1.260, 1.335, 1.414, \ 1.498, 1.588, 1.682, 1.782, 1.888, 2.000 ; Instrument #1. instr 1 ; Set the trigger. ktrig init 1 ; Use Table #1. kfn init 1 ; If the base key (note #60) is C, then 9 notes ; above it (note #60 + 9 = note #69) should be A. kindex init 69 k1 cpstun ktrig, kindex, kfn printk2 k1 endin </CsInstruments> <CsScore> ; Play Instrument #1 for one second. i 1 0 1 e </CsScore> </CsoundSynthesizer>