Recording and analyzing sound

Does the following work for you:

var w = new Waveform(512,{doubleBuffer:true,bits:16}­);
var a = new Uint16Array(512);
w.on("buffer", function(buf) {
  a.set(buf);
  E.FFT(a);
  var m=0,n=-1;
  for (var i=50;i<250;i++)if(a[i]>n)n=a[m=i];
  console.log((m*2).toFixed(0)+"Hz @ "+n);
});
w.startInput(D2,1024,{repeat:true});