index.js
function toFreq (p, tuning) {
  if (NUM.test(p)) return +p
  var midi = toMidi(asPitch.parse(p))
  if (!midi) return null
  tuning = tuning || 440
  return Math.pow(2, (midi - 69) / 12) * tuning
}
function toFreq (p, tuning) {
  if (NUM.test(p)) return +p
  var midi = toMidi(asPitch.parse(p))
  if (!midi) return null
  tuning = tuning || 440
  return Math.pow(2, (midi - 69) / 12) * tuning
}
function toFreq ( p , tuning ) { if ( NUM . test ( p ) ) return + p var midi = toMidi ( asPitch . parse ( p ) ) if ( ! midi ) return null tuning = tuning || 440 return Math . pow ( 2 , ( midi - 69 ) / 12 ) * tuning }
Get the pitch frequency in hertzs

@param {String} pitch - the pitch
@param {Integer} tuning - optional tuning, 440 by default
@return {Float} - the pitch frequency

@example
pitch.toFreq('A4') // => 440
pitch.toFreq('A3', 444) // => 222
Get the pitch frequency in hertzs