message: jsdocing constructor params
  fixes
  [skip ci]
diff: @@ -7,6 +7,8 @@ define(["Tone/core/Tone", "Tone/instrument/Instrument", "Tone/core/Buffers", "To
  * @param {Object} samples An object of samples mapping either Midi
  * Note Numbers or Scientific Pitch Notation
  * to the url of that sample.
  + * @param {Function=} onload The callback to invoke when all of the samples are loaded.
  + * @param {String=} baseUrl The root URL of all of the samples, which is prepended to all the URLs.
  * @example
  * var sampler = new Tone.Sampler({
  * "C3" : "path/to/C3.mp3",
  