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 zfilter2.wav -W ;;; for file output any platform </CsOptions> <CsInstruments> ; Required settings for WebAudio: sr = 48000 ksmps = 128 nchnls = 2 nchnls_i = 1 ; By Stefano Cucchi 2020 ; sr = 44100 ; ksmps = 32 ; nchnls = 2 0dbfs = 1 instr 1 kdamp linseg p5, p3, p6 kfreq linseg p7, p3, p8 kcps init cpspch(p4) asig1 vco2 .2, kcps asaw zfilter2 asig1, kdamp, kfreq, 2, 2, 0.81, 0.713, 0.0001, 0.99 acompare oscil 0.2, 440 ; signal comparator for volume asaw balance asaw, acompare ; adjust the volume. Volume can have big variation due to filter. outs asaw, asaw endin </CsInstruments> <CsScore> i 1 0 5 6.00 0.6 0.99 0.006 0.006 ; varying ringing time (from 0.6 to 0.99) i 1 6 5 6.00 0.3 0.3 0.01 -0.8 ; varying frequency warp factor (from 0.01 to -0.8) e </CsScore> </CsoundSynthesizer>