nycki.net/static/qrplay/v2b.min.html

<meta name=viewport content=initial-scale=1><center><p><a href=http://nycki.net/qrplay>qrplay</a></p><textarea id=f style=width:30em;height:6rem></textarea><p><button onclick='v=f.value.toLowerCase();f.A?.close();A=f.A=new AudioContext;T=[];for(c=t=o=k=Z=0,l=2;C=v[c++];z<0?0:z<2?k=z:k?0:z<4?o+=12*--d:z<6?l*=3/d:z<13?(O=new OscillatorNode(A,{type:`square`,detune:100*(`0x`+d-(v[c]==`!`)+(v[c]==`#`)+o-9)}),G=new GainNode(A,{gain:1/20}),O.connect(G),G.connect(A.destination),O.start(t),O.stop(t+=l*7/256)):z<23?t+=l*7/256:z<24?(o=0,l=2):z<31?l=1<<(z-24):(T[Z]=t,Z=+v.slice(c,c+=2),t=T[Z]|0))d=`--0229024579b`[z=`\n;-+.3cdefgab012456789x@jtsiqhwz`.indexOf(C)]'>#play</button> <button onclick=f.A.close()>#stop</button></center>