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 -odac ;;;realtime audio out ;-iadc ;;;uncomment -iadc if realtime audio input is needed too ; For Non-realtime ouput leave only the line below: ; -o GEN42.wav -W ;;; for file output any platform </CsOptions> <CsInstruments> ; Required settings for WebAudio: sr = 48000 ksmps = 128 nchnls = 2 nchnls_i = 1 ; sr = 44100 ; ksmps = 32 ; nchnls = 2 0dbfs = 1 instr 1 ktab = 1 ;ftable 1 kurd = urd(ktab) ktrig metro 5 ;triggers 5 times per second kres samphold kurd, ktrig ;sample and hold value of kurd printk2 kres ;print it asig poscil .5, 220+kres, 2 outs asig, asig endin instr 2 seed 0 ;every run new values ktab = 1 ;ftable 1 kurd = urd(ktab) ktrig metro 5 ;triggers 5 times per second kres samphold kurd, ktrig ;sample and hold value of kurd printk2 kres ;print it asig poscil .5, 220+kres, 2 outs asig, asig endin </CsInstruments> <CsScore> f1 0 -20 -42 10 20 .3 100 200 .7 ;30% choose between 10 and 20 and 70% between 100 and 200 f2 0 8192 10 1 ;sine wave i 1 0 5 i 2 6 5 e </CsScore> </CsoundSynthesizer>