clarify listener registration

[shanemikel]

Figuring out how to properly register and unregister listeners that use the .listen method is unclear to me. If I create a spectrum object for instance:

var saw = T("pink", {mul:0.15}).play();

var fft = T("spectrum", {size:512, interval:100}).on("data", function() {
  fft.plot({target:canvas});
}).listen(saw);

Is this removable through calling fft.removeAllListeners(), or saw.removeAllListeners(), or is this completely separate? If so, could somebody add documentation for the listen and unlisten methods (or point me to it if I have missed it).