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> <CsInstruments> ; Required settings for WebAudio: sr = 48000 ksmps = 128 nchnls = 2 nchnls_i = 1 ; ksmps = 32 0dbfs = 1.0 ; nchnls = 2 instr 1 ;; rhythm array - these steps values multiplied by tempo (ticks) in BPM irhythm[] fillarray 1, 1.5, 0.5, 0.5, 0.5, 0.5, 1.5, 1 ;; instrument array - instrument number to render for each step inst0[] fillarray 11, 12, 13, 14, 15, 16, 17, 18 inst1[] fillarray 19, 20, 21, 22, 23, 24, 25, 26 ;; note array - here in cpsmidinn - esentially the 'p4' output from opcode ;; can be any sequence of values inotes[] fillarray 60, 61, 62, 63, 64, 65, 66, 67 ;; variable tempo kspeed line 60, p3, 180 ;; rhythm, inst, notes, bpm, length, mode, verbose kSeq0 sequ irhythm, inst0, inotes, kspeed, 8 kSeq1 sequ irhythm, inst1, inotes, kspeed * 1.2, 8 endin instr 11, 12, 13, 14, 15, 16, 17, 18 kl linseg 0, p3*0.01, 1, p3*.99, 0 a1 oscil 0.9, cpsmidinn(p4) outs1 a1*kl endin instr 19, 20, 21, 22, 23, 24, 25, 26 kl linseg 0, p3*0.01, 1,p3*.99, 0 a1 oscil 0.9, cpsmidinn(p4) outs2 a1*kl endin </CsInstruments> <CsScore> i1 0 60 e </CsScore> </CsoundSynthesizer>