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 No messages -odac -iadc -d -M0 -Q1 ;;;RT audio I/O with MIDI in </CsOptions> <CsInstruments> ; Required settings for WebAudio: sr = 48000 ksmps = 128 nchnls = 2 nchnls_i = 1 ; sr = 44100 ; kr = 4410 ; ksmps = 10 ; nchnls = 2 ; Example by Giorgio Zucco 2007 instr 1 ;Triggered by MIDI notes on channel 1 ifund notnum ivel veloc knote1 init ifund knote2 init ifund + 3 knote3 init ifund + 5 ;minor chord on MIDI out channel 1 ;Needs something plugged to csound's MIDI output midion 1, knote1,ivel midion 1, knote2,ivel midion 1, knote3,ivel endin </CsInstruments> <CsScore> ; Dummy ftable f0 60 </CsScore> </CsoundSynthesizer>