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 -odac -iadc ;;;RT audio I/O ; For Non-realtime ouput leave only the line below: ; -o subinstr.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 ; Instrument #1 - Creates a basic tone. instr 1 ; Print the value of p4, should be equal to ; Instrument #2's iamp field. print p4 ; Print the value of p5, should be equal to ; Instrument #2's ipitch field. print p5 ; Create a tone. asig oscils p4, p5, 0 out asig endin ; Instrument #2 - Demonstrates the subinstr opcode. instr 2 iamp = 20000 ipitch = 440 ; Use Instrument #1 to create a basic sine-wave tone. ; Its p4 parameter will be set using the iamp variable. ; Its p5 parameter will be set using the ipitch variable. abasic subinstr 1, iamp, ipitch ; Output the basic tone that we have created. out abasic endin </CsInstruments> <CsScore> ; Table #1, a sine wave. f 1 0 16384 10 1 ; Play Instrument #2 for one second. i 2 0 1 e </CsScore> </CsoundSynthesizer>