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 values are multiplied by tempo (ticks) in BPM irhythm0[] fillarray 1, 1.5, 0.5, 0.5, 0.5, 0.5, 1.5, 1 ;; instrument array - instrument number to render for each step iinsts0[] fillarray 11, 12, 13, 14, 15, 16, 17, 18 ;; note array - here cpsmidinn(p4), amps(p5), mod ratios(p6), mod indices(p7) ;; - esentially the 'p4', 'p5', 'p6' and 'p7' are output from sequ inotes[][] init 4,8 ;initialize 4 rows with 8 columns - p4=pitch, p5=amp, p6=modratio, p7=modindex inotes fillarray 60, 61, 62, 63, 64, 65, 66, 67, \ 0.8, 0.3, 0.6, 0.2, 0.7, 0.4, 0.5, 0.6, \ 1, 2, 3, 4, 5, 6, 7, 8, \ 1, 11, 2, 12, 3, 21, 4, 22 ;; NOTE: this can be any sequence of values ;; variable tempo kspeed linseg 85, p3*.7, 85, p3*.3, 240 ;; rhythms, insts, notes, bpm, length, mode, step, reset, verbose kSeq sequ irhythm0, iinsts0, inotes, kspeed, 8, p4 endin instr 11, 12, 13, 14, 15, 16, 17, 18 kenv linseg 0, p3*0.01, 1, p3*.99, 0 asig foscil p5, cpsmidinn(p4), 1, p6, p7 outall asig * kenv endin </CsInstruments> <CsScore> i1 0 15 0 ;; forward mode s f0 1 s i1 0 15 -1 ;; backward mode s f0 1 s i1 0 15 -2 ;; forward and backward mode s f0 1 s i1 0 15 -3 ;; random s f0 1 s i1 0 6 -4 ;; play forward once and stop s f0 1 s i1 0 6 -5 ;; play backward once and stop s f0 1 s i1 0 15 -6 ;; shuffle mode s f0 1 s i1 0 30 1 ;; mutate after each step s f0 1 s i1 0 30 2 ;; mutate each second step s f0 1 s i1 0 30 4 ;; mutate every four steps e </CsScore> </CsoundSynthesizer>