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 FLroller.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 flroller controlled frequency ; sr = 44100 ; kr = 441 ; ksmps = 100 ; nchnls = 1 FLpanel "Frequency Roller", 900, 400, 50, 50 ; Minimum value output by the roller imin = 200 ; Maximum value output by the roller imax = 5000 ; Increment with each pixel istep = 1 ; Logarithmic type roller selected iexp = -1 ; Roller graphic type (1=horizontal) itype = 1 ; Display handle (-1=not used) idisp = -1 ; Width of the roller in pixels iwidth = 300 ; Height of the roller in pixels iheight = 50 ; Distance of the left edge of the knob ; from the left edge of the panel ix = 300 ; Distance of the top edge of the knob ; from the top edge of the panel iy = 50 gkfreq, ihandle FLroller "Frequency", imin, imax, istep, iexp, itype, idisp, 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>