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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 RT audio input is needed too ; For Non-realtime ouput leave only the line below: ; -o t.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 aenv expseg .01, p3*0.25, 1, p3*0.75, 0.01 asig poscil3 .8*aenv, p4, 1 outs asig, asig endin </CsInstruments> <CsScore> f 1 0 16384 10 1 ;sine wave t 0 240 12 30 15 240 ;start tempo = 240 i 1 0 2 110 ;tempo = 240 i 1 3 2 220 ;slow down & i 1 6 2 440 ;slow down & i 1 9 2 880 ;slow down & i 1 12 2 110 ;slow down to 30 at 12 seconds i 1 15 2 220 ;speed up to 240 again i 1 18 2 440 ;stay at tempo 240 i 1 21 2 880 e </CsScore> </CsoundSynthesizer>