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.
-d -o dac instr 1 a1 flooper2 1000,p4,2,5,0.1,1 out a1 endin instr 2 ires readscore {{ {12 COUNT i1 $COUNT 1 [1 + $COUNT/12] } }} endin f0 12 f 1 0 0 1 "fox.wav" 0 0 1 i2 0 1