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 FLcount.wav -W ;;; for file output any platform </CsOptions> <CsInstruments> ; Required settings for WebAudio: sr = 48000 ksmps = 128 nchnls = 2 nchnls_i = 1 ; Demonstration of the flcount opcode ; clicking on the single arrow buttons ; increments the oscillator in semitone steps ; clicking on the double arrow buttons ; increments the oscillator in octave steps ; sr = 44100 ; kr = 441 ; ksmps = 100 ; nchnls = 1 FLpanel "Counter", 900, 400, 50, 50 ; Minimum value output by counter imin = 6 ; Maximum value output by counter imax = 12 ; Single arrow step size (semitones) istep1 = 1/12 ; Double arrow step size (octave) istep2 = 1 ; Counter type (1=double arrow counter) itype = 1 ; Width of the counter in pixels iwidth = 200 ; Height of the counter in pixels iheight = 30 ; Distance of the left edge of the counter ; from the left edge of the panel ix = 50 ; Distance of the top edge of the counter ; from the top edge of the panel iy = 50 ; Score event type (-1=ignored) iopcode = -1 gkoct, ihandle FLcount "pitch in oct format", imin, imax, istep1, istep2, itype, iwidth, iheight, ix, iy, iopcode, 1, 0, 1 ; End of panel contents FLpanelEnd ; Run the widget thread! FLrun instr 1 iamp = 15000 ifn = 1 asig oscili iamp, cpsoct(gkoct), 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>