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 -odac ;;;realtime audio out ;-iadc ;;;uncomment -iadc if realtime audio input is needed too ; For Non-realtime ouput leave only the line below: ; -o pvsmooth.wav -W ;;; for file output any platform </CsOptions> <CsInstruments> ; Required settings for WebAudio: sr = 48000 ksmps = 128 nchnls = 2 nchnls_i = 1 ; sr = 44100 ; ksmps = 32 ; nchnls = 2 0dbfs = 1 instr 1 kacf = p4 kfcf = p5 asig soundin "fox.wav" fsig pvsanal asig, 1024, 256, 1024, 1 ; analyse it ftps pvsmooth fsig, kacf, kfcf atps pvsynth ftps ; synthesise it outs atps*3, atps*3 endin </CsInstruments> <CsScore> ; amp freq i 1 0 3 0.01 0.01 ;smooth amplitude and frequency with cutoff frequency of filter at 1% of 1/2 frame-rate (ca 0.86 Hz) i 1 + 3 1 0.01 ;no smoothing on amplitude, but frequency with cf at 1% of 1/2 frame-rate (ca 0.86 Hz) i 1 + 10 .001 1 ;smooth amplitude with cf at 0.1% of 1/2 frame-rate (ca 0.086 Hz) ;and no smoothing of frequency e </CsScore> </CsoundSynthesizer>