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 FLtext.wav -W ;;; for file output any platform </CsOptions> <CsInstruments> ; Required settings for WebAudio: sr = 48000 ksmps = 128 nchnls = 2 nchnls_i = 1 ; A sine with oscillator with fltext box controlled ; frequency either click and drag or double click and ; type to change frequency value ; sr = 44100 ; kr = 441 ; ksmps = 100 ; nchnls = 1 FLpanel "Frequency Text Box", 270, 600, 50, 50 ; Minimum value output by the text box imin = 200 ; Maximum value output by the text box imax = 5000 ; Step size istep = 1 ; Text box graphic type itype = 1 ; Width of the text box in pixels iwidth = 70 ; Height of the text box in pixels iheight = 30 ; Distance of the left edge of the text box ; from the left edge of the panel ix = 100 ; Distance of the top edge of the text box ; from the top edge of the panel iy = 300 gkfreq,ihandle FLtext "Enter the frequency", imin, imax, istep, itype, iwidth, iheight, ix, iy ; End of panel contents FLpanelEnd ; Run the widget thread! FLrun instr 1 iamp = 15000 ifn = 1 asig oscili iamp, gkfreq, ifn out asig endin </CsInstruments> <CsScore> ; Function table that defines a single cycle ; of a sine wave. f 1 0 1024 10 1 ; Instrument 1 will play a note for 1 hour. i 1 0 3600 e </CsScore> </CsoundSynthesizer>