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 No messages MIDI in -odac -d -M0 ;;;RT audio I/O with MIDI in ;-iadc ;;;uncomment -iadc if RT audio input is needed too ; For Non-realtime ouput leave only the line below: ; -o chanctrl.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 ; press your midi keyboard and move your midi controller to see result ichnl = 1 ;MIDI note inputs on channel 1 ictlno = 7 ;use midi volume controller kch chanctrl ichnl, 7 ;to control amplitude of oscil printk2 kch asig oscil kch*(1/127), 220, 1 outs asig, asig endin </CsInstruments> <CsScore> ;Dummy f-table to give time for real-time MIDI events f 0 30 ;sine wave. f 1 0 16384 10 1 e </CsScore> </CsoundSynthesizer>