mlua-pulse 0.1.0

Lua-friendly music composition and audio export bindings built on tunes and mlua
Documentation 
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local pulse = require("pulse")

local title = "fresh-pop"
local bpm = 112.0
local beat = 60.0 / bpm
local export_options = {
  sample_rate = 44100,
  normalize = "rms",
  target_db = -15.5,
  true_peak_db = -1.0,
  midi_velocity_gain = 2.0,
  midi_min_velocity = 0.62,
}

local function rep(value, count)
  local values = {}
  for index = 1, count do
    values[index] = value
  end
  return values
end

local function degree(scale, value)
  local unique = #scale - 1
  local zero = value - 1
  local octave = math.floor(zero / unique)
  local position = (zero % unique) + 1
  return pulse.transpose(scale[position], octave * 12)
end

local function line(scale, degrees)
  local notes = {}
  for index, value in ipairs(degrees) do
    notes[index] = degree(scale, value)
  end
  return notes
end

local function pop_beat(kick, hats, volume)
  return pulse.drum_machine("808")
    :steps(16)
    :step_duration(beat / 4.0)
    :kick(kick)
    :snare("----x-------x---")
    :hihat(hats)
    :clap("----x-------x---")
    :grid()
    :repeat_times(3)
    :volume(volume)
    :effect("compressor", "drum_bus")
end

local e_major = pulse.scale("E4", "ionian")
local c_sharp_minor = pulse.scale("C#3", "minor")
local b_mixolydian = pulse.scale("B3", "mixolydian")

local verse = pulse.phrase()
  :add(
    pulse.sequence()
      :chords({pulse.chord("E3", "maj7"), pulse.chord("B2", "dominant7"), pulse.chord("C#3", "min7"), pulse.chord("A2", "maj7")})
      :durations(rep(beat * 4.0, 4))
      :instrument("electric_piano")
      :volume(0.58)
      :pan(-0.18)
      :velocity(0.52)
      :effect("chorus", "classic")
  )
  :add(
    pulse.sequence()
      :notes(line(e_major, {3, 5, 6, 8, 9, 8, 6, 5, 3, 5, 6, 8, 10, 9, 8, 6}))
      :durations(rep(beat, 16))
      :instrument("ukulele")
      :volume(0.34)
      :pan(0.24)
      :velocity(0.46)
      :at(beat / 2.0)
      :effect("reverb", "plate")
  )
  :add(
    pulse.sequence()
      :notes(line(c_sharp_minor, {1, 1, 5, 5, 6, 6, 4, 4, 1, 1, 5, 5, 6, 6, 4, 4}))
      :durations(rep(beat, 16))
      :instrument("fingerstyle_bass")
      :volume(0.7)
      :velocity(0.72)
  )
  :add_drum_grid(pop_beat("x---x-----x-x---", "x-x-x-x-x-x-x-x-", 0.58))
  :repeat_times(2)

local chorus = pulse.phrase()
  :add(
    pulse.sequence()
      :chords({pulse.chord("A2", "maj7"), pulse.chord("B2", "dominant7"), pulse.chord("E3", "maj7"), pulse.chord("C#3", "min7")})
      :durations(rep(beat * 4.0, 4))
      :instrument("warm_pad")
      :volume(0.5)
      :pan(0.12)
      :velocity(0.5)
      :effect("reverb", "ambient")
  )
  :add(
    pulse.sequence()
      :notes(line(e_major, {8, 9, 10, 12, 10, 9, 8, 6, 8, 9, 10, 12, 13, 12, 10, 8}))
      :durations(rep(beat, 16))
      :instrument("supersaw")
      :volume(0.42)
      :pan(-0.18)
      :velocity(0.56)
      :effect("filter", { type = "low_pass", cutoff = 4200.0, resonance = 0.2 })
      :effect("delay", "dotted_eighth")
  )
  :add(
    pulse.sequence()
      :notes(line(c_sharp_minor, {6, 6, 7, 7, 1, 1, 5, 5, 6, 6, 7, 7, 1, 1, 5, 5}))
      :durations(rep(beat, 16))
      :instrument("picked_bass")
      :volume(0.76)
      :velocity(0.78)
  )
  :add_drum_grid(pop_beat("x---x-x-x---x-x-", "x-xxxxxxx-xxxxxx", 0.7))
  :repeat_times(2)

local bridge = pulse.phrase()
  :add(
    pulse.sequence()
      :chords({pulse.chord("B2", "dominant7"), pulse.chord("A2", "maj7"), pulse.chord("F#2", "min7"), pulse.chord("B2", "dominant7")})
      :durations(rep(beat * 4.0, 4))
      :instrument("electric_piano")
      :volume(0.48)
      :pan(-0.12)
      :velocity(0.46)
      :effect("phaser", "subtle")
  )
  :add(
    pulse.sequence()
      :notes(line(b_mixolydian, {1, 3, 5, 7, 8, 7, 5, 3, 1, 3, 5, 7, 8, 10, 8, 7}))
      :durations(rep(beat, 16))
      :instrument("music_box")
      :volume(0.3)
      :pan(0.26)
      :velocity(0.44)
      :effect("delay", "eighth_note")
  )
  :repeat_times(1)

local song = pulse.song()
  :tempo(bpm)
  :add_phrase(verse)
  :add_phrase(chorus)
  :add_phrase(bridge)
  :add_phrase(chorus)
  :master_effect("reverb", "room")
  :master_effect("eq", "bright")
  :master_effect("limiter", "transparent")

assert(title == "fresh-pop")
song:export_wav("output/fresh-pop.wav", export_options)
song:export_flac("output/fresh-pop.flac", export_options)
song:export_midi("output/fresh-pop.mid", export_options)