>
  <p>136 band-limited wavetables are generated for each MIDI note. Pitch
  bending is supported as high as 21100 Hz. 21100 Hz is derived from
  MIDI note number 136. Frequency of MIDI note number 137 is higher then
  22050 Hz. That’s why 136 is selected.</p>
  <p>When fundamental frequency of a note is lower than 8.18 Hz, some
  overtones on high frequency may lost. However, cubic interpolation may
  cause noise which makes those frequency not to be 0.</p>
  <pre><code>noteToFreq(note) := 440 * Math.pow