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 FLslider.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 flslider controlled frequency ; sr = 44100 ; kr = 441 ; ksmps = 100 ; nchnls = 1 FLpanel "Frequency Slider", 900, 400, 50, 50 ; Minimum value output by the slider imin = 200 ; Maximum value output by the slider imax = 5000 ; Logarithmic type slider selected iexp = -1 ; Slider graphic type (5='nice' slider) itype = 5 ; Display handle (-1=not used) idisp = -1 ; Width of the slider in pixels iwidth = 750 ; Height of the slider in pixels iheight = 30 ; Distance of the left edge of the slider ; from the left edge of the panel ix = 125 ; Distance of the top edge of the slider ; from the top edge of the panel iy = 50 gkfreq, ihandle FLslider "Frequency", imin, imax, iexp, itype, idisp, iwidth, iheight, ix, iy ; End of panel contents FLpanelEnd ; Run the widget thread! FLrun ;Set the widget's initial value FLsetVal_i 300, ihandle instr 1 iamp = 15000 ifn = 1 kfreq portk gkfreq, 0.005 ;Smooth gkfreq to avoid zipper noise asig oscili iamp, kfreq, 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>