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 -n ;;;no sound ;-iadc ;;;uncomment -iadc if realtime audio input is needed too ; For Non-realtime ouput leave only the line below: ; -o rtclock.wav -W ;;; for file output any platform </CsOptions> <CsInstruments> ; Required settings for WebAudio: sr = 48000 ksmps = 128 nchnls = 2 nchnls_i = 1 ;after an example by Iain McCurdy ; sr = 44100 ; ksmps = 32 ; nchnls = 2 0dbfs = 1 FLcolor 200, 200, 200, 0, 0, 0 ; LABEL | WIDTH | HEIGHT | X | Y FLpanel "rtclock", 500, 130, 0, 0 ; ON,OFF,TYPE,WIDTH, HEIGHT, X, Y, OPCODE, INS,START,IDUR gkOnOff,ihOnOff FLbutton "On/Off", 1, 0, 22, 150, 25, 5, 5, 0, 1, 0, 3600 gkExit,ihExit FLbutton "exitnow",1, 0, 21, 150, 25, 345, 5, 0, 999, 0, 0.001 FLsetColor2 255, 0, 50, ihOnOff ;reddish color ;VALUE DISPLAY BOXES WIDTH,HEIGHT,X, Y gidclock FLvalue "clock", 100, 25, 200, 60 FLsetVal_i 1, ihOnOff FLpanel_end FLrun instr 1 if gkOnOff !=0 kgoto CONTINUE ;sense if FLTK on/off switch is not off (in which case skip the next line) turnoff ;turn this instr. off now CONTINUE: ktime rtclock ;clock continues to run even FLprintk2 ktime, gidclock ;after the on/off button was used to stop endin instr 999 exitnow ;exit Csound as fast as possible endin </CsInstruments> <CsScore> f 0 60 ;runs 60 seconds e </CsScore> </CsoundSynthesizer>