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 -odac --limiter=.95 ;;;realtime audio out ; For Non-realtime ouput leave only the line below: ; -o svfilter.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 idur = p3 ifreq = p4 iamp = p5 ilowamp = p6 ; determines amount of lowpass output in signal ihighamp = p7 ; determines amount of highpass output in signal ibandamp = p8 ; determines amount of bandpass output in signal iq = p9 ; value of q iharms = (sr*.4) / ifreq asig gbuzz .4, ifreq, iharms, 1, .9, 1 ; Sawtooth-like waveform kfreq linseg 1, idur * 0.5, 4000, idur * 0.5, 1 ; Envelope to control filter cutoff alow, ahigh, aband svfilter asig, kfreq, iq aout1 = alow * ilowamp aout2 = ahigh * ihighamp aout3 = aband * ibandamp asum = aout1 + aout2 + aout3 kenv linseg 0, .1, iamp, idur -.2, iamp, .1, 0 ; Simple amplitude envelope outs asum * kenv, asum * kenv endin </CsInstruments> <CsScore> f1 0 8192 9 1 1 .25 i1 0 5 100 .1 1 0 0 5 ; lowpass sweep i1 5 5 200 .1 1 0 0 30 ; lowpass sweep, octave higher, higher q i1 10 5 100 .1 0 1 0 5 ; highpass sweep i1 15 5 200 .1 0 1 0 30 ; highpass sweep, octave higher, higher q i1 20 5 100 .1 0 0 1 5 ; bandpass sweep i1 25 5 200 .1 0 0 1 30 ; bandpass sweep, octave higher, higher q i1 30 5 200 .2 .4 .6 0 ; notch sweep - notch formed by combining highpass and lowpass outputs e </CsScore> </CsoundSynthesizer>