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 -F midichn_advanced.mid ;;;realtime audio out with MIDI file input ; For Non-realtime ouput leave only the line below: ; -o midichn_advanced.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 massign 1, 1 ; all channels use instr 1 massign 2, 1 massign 3, 1 massign 4, 1 massign 5, 1 massign 6, 1 massign 7, 1 massign 8, 1 massign 9, 1 massign 10, 1 massign 11, 1 massign 12, 1 massign 13, 1 massign 14, 1 massign 15, 1 massign 16, 1 gicnt = 0 ; note counter instr 1 gicnt = gicnt + 1 ; update note counter kcnt init gicnt ; copy to local variable ichn midichn ; get channel number istime times ; note-on time if (ichn > 0.5) goto l2 ; MIDI note printks "note %.0f (time = %.2f) was activated from the score\\n", \ 3600, kcnt, istime goto l1 l2: printks "note %.0f (time = %.2f) was activated from channel %.0f\\n", \ 3600, kcnt, istime, ichn l1: icps cpsmidi ; convert midi note to pitch kenv madsr 0.1, 0, 0.8, 0.9 asig pluck kenv, icps, icps, 1, 1 outs asig, asig endin </CsInstruments> <CsScore> t 0 60 ;beats per minute f 0 8 ;stay active for 8 seconds f 1 0 4096 10 1 ;sine e </CsScore> </CsoundSynthesizer>