set(freq, res, time) {
    if (freq) {
      this.freq(freq, time);
    }
    if (res) {
      this.res(res, time);
    }
  }
Set the frequency and the resonance of the filter.

 @method  set
 @param {Number} [freq] Frequency in Hz, from 10 to 22050
 @param {Number} [res]  Resonance (Q) from 0.001 to 1000
 @param {Number} [timeFromNow] schedule this event to happen
                               seconds from now