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 ; Audio out Audio in No messages -odac -iadc -d ;;;RT audio I/O ; For Non-realtime ouput leave only the line below: ; -o zkwm.wav -W ;;; for file output any platform </CsOptions> <CsInstruments> ; Required settings for WebAudio: sr = 48000 ksmps = 128 nchnls = 2 nchnls_i = 1 ; Initialize the global variables. ; sr = 44100 ; kr = 4410 ; ksmps = 10 ; nchnls = 1 ; Initialize the ZAK space. ; Create 1 a-rate variable and 1 k-rate variable. zakinit 1, 1 ; Instrument #1 -- a basic instrument. instr 1 ; Generate a k-rate signal. ; The signal goes from 30 to 20,000 then back to 30. kramp linseg 30, p3/2, 20000, p3/2, 30 ; Mix the signal into the zk variable #1. zkwm kramp, 1 endin ; Instrument #2 -- another basic instrument. instr 2 ; Generate another k-rate signal. ; This is a low frequency oscillator. klfo lfo 3500, 2 ; Mix this signal into the zk variable #1. zkwm klfo, 1 endin ; Instrument #3 -- generates audio output. instr 3 ; Read zk variable #1, containing a mix of both signals. kamp zkr 1 ; Create a sine waveform. Its amplitude will vary ; according to the values in zk variable #1. a1 oscil kamp, 880, 1 ; Generate the audio output. out a1 ; Clear the zk variable, get it ready for ; another pass. zkcl 0, 1 endin </CsInstruments> <CsScore> ; Table #1, a sine wave. f 1 0 16384 10 1 ; Play Instrument #1 for 5 seconds. i 1 0 5 ; Play Instrument #2 for 5 seconds. i 2 0 5 ; Play Instrument #3 for 5 seconds. i 3 0 5 e </CsScore> </CsoundSynthesizer>