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 -d </CsOptions> <CsInstruments> ; Required settings for WebAudio: sr = 48000 ksmps = 128 nchnls = 2 nchnls_i = 1 ; sr = 44100 ; ksmps = 64 ; nchnls = 1 0dbfs = 1 gifn ftgen 0,0,0,1,"fox.wav",0,0,1 gifw ftgen 0,0,1024,20,2,1 instr 1 koff init 0 kts = p4 // timescale a1 diskin "beats.wav",1,0,1 a3 lpcfilter a1,koff,1,gifn,1024,ksmps,gifw koff += ksmps*kts if koff > ftlen(gifn) then koff = 0 endif a3 dcblock a3 out a3 endin </CsInstruments> <CsScore> i1 0 10 1 i1 10 10 .75 i1 20 10 1.5 </CsScore> </CsoundSynthesizer>