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.
; Select audio/midi flags here according to platform -odac -M0 ;;;realtime audio I/O with MIDI in ;-iadc ;;;uncomment -iadc if RT audio input is needed too ; Required settings for WebAudio: sr = 48000 ksmps = 128 nchnls = 2 nchnls_i = 1 ; sr = 44100 ; ksmps = 32 ; nchnls = 2 0dbfs = 1 instr 1 ; expects MIDI controller input on channel 1 ; run and move your midi controller to see result imax = 1 imin = 0 ichan = 1 ictlno = 7 initc7 1, 7, 1 ; start at max. volume kamp ctrl7 ichan, ictlno, imin, imax ; controller 7 printk2 kamp asig oscil kamp, 220, 1 outs asig, asig endin f 1 0 4096 10 1 i1 0 20 e