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 sfplay3.wav -W ;;; for file output any platform </CsOptions> <CsInstruments> ; Required settings for WebAudio: sr = 48000 ksmps = 128 nchnls = 2 nchnls_i = 1 ; By Menno Knevel - 2020 ; sr = 44100 ; ksmps = 32 ; nchnls = 2 0dbfs = 1 gitwelve ftgen 1, 0, 16, -2, 12, 2, 440, 69, 1, 16/15, 9/8, 6/5, 5/4, 4/3, 7/5, 3/2, 8/5, 5/3, 9/5, 15/8, 2 givife ftgen 2, 0, 16, -2, 5, 2, 261.659, 60, 1, 1.1486, 1.3195, 1.5157, 1.7411, 2.00 giSF sfload "01hpschd.sf2" sfplist giSF gipre sfpreset 0, 0, giSF, 0 instr 1 ikey = p4 ivel = p5 aenv linsegr 1, 1, 1, 1, 0 ;envelope icps cpstuni ikey, gitwelve ;12 tones per octave iamp = 0.00001 ;scale amplitude down a lot, due to 0dbfs = 1 iamp *= ivel ;make velocity-dependent aL, aR sfplay3 ivel, ikey, iamp, icps, gipre, 1 aL = aL * aenv aR = aR * aenv outs aL, aR endin instr 2 ikey = p4 ivel = p5 aenv linsegr 1, 1, 1, 1, 0 ;envelope icps cpstuni ikey, givife ;5 tones per octave iamp = 0.00001 ;scale amplitude down a lot, due to 0dbfs = 1 iamp *= ivel ;make velocity-dependent aL, aR sfplay3 ivel, ikey, iamp, icps, gipre, 1 aL = aL * aenv aR = aR * aenv outs aL, aR endin </CsInstruments> <CsScore> ;instr.1 using ftable 1 i1 0 1 60 100 i1 + 1 62 < i1 + 1 65 < i1 + 1 69 40 ;instr.2 using ftable 2 i2 5 1 60 100 i2 + 1 62 < i2 + 1 65 < i2 + 1 69 40 e </CsScore> </CsoundSynthesizer>