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 -m0d --midi-key-cps=4 -F midiChords.mid ;-iadc ;;;uncomment -iadc if realtime audio input is needed too </CsOptions> <CsInstruments> ; Required settings for WebAudio: sr = 48000 ksmps = 128 nchnls = 2 nchnls_i = 1 ; by Menno Knevel - 2021 ; sr = 44100 ; ksmps = 32 ; nchnls = 2 0dbfs = 1 ; midiChords.mid can be found in examples folder instr 1 ivel veloc 0, 1 ;re-scale velocity to 0 - 1 print ivel ;print velocity asig vco2 .1*ivel, p4 ; outs asig, asig endin </CsInstruments> <CsScore> i1 0 35 ;midi file = 35 seconds e </CsScore> </CsoundSynthesizer>