message: fix set to use exponent instead of value
diff: @@ -39,7 +39,7 @@ describe("Pow", () => {
  return ConstantOutput(() => {
  var signal = new Signal(0.5);
  var pow = new Pow(1);
  - pow.value = 3;
  + pow.exponent = 3;
  signal.connect(pow);
  pow.toDestination();
  }, 0.125);
  