How to use the tonal.midi function in tonal

function take (nameGen, start, len) {
  if (arguments.length === 1) return (s, l) => take(nameGen, s, l)
  if (arguments.length === 2) return (l) => take(nameGen, start, l)
  var midi = _.midi(start)
  return (midi === null) ? []
   : _take(genFn(nameGen), [], dir(len), midi, abs(len))
}

export function take (nameGen, start, len) {
  if (arguments.length === 1) return (s, l) => take(nameGen, s, l)
  if (arguments.length === 2) return (l) => take(nameGen, start, l)
  var midi = _.midi(start)
  return (midi === null) ? []
   : _take(genFn(nameGen), [], dir(len), midi, abs(len))
}

function _range (a, b) {
  const ma = _.midi(a)
  const mb = _.midi(b)
  return ma !== null && mb !== null ? midiR(ma, mb) : []
}

function _range (a, b) {
  const ma = _.midi(a)
  const mb = _.midi(b)
  return ma !== null && mb !== null ? midiR(ma, mb) : []
}

function _range (a, b) {
  const ma = _.midi(a)
  const mb = _.midi(b)
  return ma !== null && mb !== null ? midiR(ma, mb) : []
}

function _range (a, b) {
  const ma = _.midi(a)
  const mb = _.midi(b)
  return ma !== null && mb !== null ? midiR(ma, mb) : []
}