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> -odac -B441 -b441 </CsOptions> <CsInstruments> ; Required settings for WebAudio: sr = 48000 ksmps = 128 nchnls = 2 nchnls_i = 1 ; sr = 44100 ; kr = 100 ; ksmps = 441 ; nchnls = 2 gkindx init -1 instr 1 kindex init 0 ktrig metro 0.5 if ktrig = 0 goto noevent gkindx = gkindx + 1 noevent: endin instr 2 kout1 init 0 kout2 init 0 kout3 init 0 kout4 init 0 vtablek gkindx, 1, 1, 0, kout1,kout2, kout3, kout4 printk2 kout1 printk2 kout2 printk2 kout3 printk2 kout4 endin </CsInstruments> <CsScore> f 1 0 32 10 1 i 1 0 20 i 2 0 20 </CsScore> </CsoundSynthesizer>