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> --nosound </CsOptions> <CsInstruments> ; Required settings for WebAudio: sr = 48000 ksmps = 128 nchnls = 2 nchnls_i = 1 instr 1 S4 mton ntom("7D+63") puts S4, 1 S1 mton 60 printf_i "midi 60 = %s \n", 1, S1 S2 mton ftom(442) printf_i "442 Hz = %s \n", 1, S2 S3 = mton(48.25) printf_i "midi 48.25 = %s \n", 1, S3 k1 = ntom("4C") printf_i "4C = midi %f \n", 1, k1 i2 ntom "4E" printf_i "4E = %f \n", 1, i2 S5 = mton(ntom("4G+")) printf_i "roundtrip 4G+: %s \n", 1, S5 turnoff endin instr 2 ; test i-time and k-time execution k1 = ntom("4Eb-31") printf "4Eb-31 = %f \n", 1, k1 i0 ntom "4C+" printf_i "4C+ = %f \n", 1, i0 i1 = ntom:i("4A") printf_i "4A = %f \n", 1, i1 turnoff endin </CsInstruments> <CsScore> i 1 0 1 i 2 0 1 </CsScore> </CsoundSynthesizer>