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 = "kaze-ensemble"
local bpm = 88.0
local beat = 60.0 / bpm
local export_options = {
  sample_rate = 44100,
  normalize = "rms",
  target_db = -17.5,
  true_peak_db = -1.2,
  midi_velocity_gain = 2.0,
  midi_min_velocity = 0.6,
}

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 voicing(root, kind, shifts)
  local source = pulse.chord(root, kind)
  local chord = {}
  for index, shift in ipairs(shifts) do
    chord[index] = pulse.transpose(source[((index - 1) % #source) + 1], shift)
  end
  return chord
end

local g4 = pulse.scale("G4", "ionian")
local g3 = pulse.scale("G3", "ionian")
local e3 = pulse.scale("E3", "minor")
local c4 = pulse.scale("C4", "lydian")
local d4 = pulse.scale("D4", "mixolydian")
local g_bass = pulse.scale("G2", "ionian")
local e_bass = pulse.scale("E2", "minor")

local soft_filter = { type = "low_pass", cutoff = 5200.0, resonance = 0.12 }
local string_filter = { type = "low_pass", cutoff = 4300.0, resonance = 0.1 }

local function soft_kick(volume)
  return pulse.drum_grid()
    :sound("kick_acoustic", {0, 8})
    :sound("cajon", {4, 12})
    :step_duration(beat / 4.0)
    :volume(volume)
    :effect("filter", { type = "low_pass", cutoff = 1800.0, resonance = 0.08 })
    :effect("compressor", "gentle")
end

local intro = pulse.phrase()
  :add(
    pulse.sequence()
      :chords({
        voicing("G3", "maj7", {0, 12, 0, 12}),
        voicing("D3", "dominant7", {0, 12, 0, 12}),
        voicing("E3", "min7", {0, 12, 0, 12}),
        voicing("C3", "maj7", {0, 12, 0, 12}),
      })
      :durations(rep(beat * 2.0, 4))
      :instrument("acoustic_guitar")
      :volume(0.36)
      :pan(-0.24)
      :velocity(0.42)
      :effect("filter", soft_filter)
      :effect("reverb", "room")
  )
  :add(
    pulse.sequence()
      :notes(line(g4, {5, 6, 8, 6, 5, 3, 2, 3}))
      :durations(rep(beat, 8))
      :instrument("flute")
      :volume(0.22)
      :pan(0.22)
      :velocity(0.34)
      :at(beat)
      :effect("filter", soft_filter)
      :effect("reverb", "chamber")
  )
  :add(
    pulse.sequence()
      :notes(line(g_bass, {1, 5, 6, 3, 4, 1, 5, 5}))
      :durations(rep(beat, 8))
      :instrument("upright_bass")
      :volume(0.38)
      :velocity(0.48)
  )
  :repeat_times(2)

local verse = pulse.phrase()
  :add(
    pulse.sequence()
      :chords({
        voicing("G3", "maj7", {0, 12, 0, 12}),
        voicing("B2", "min7", {0, 12, 0, 12}),
        voicing("C3", "maj7", {0, 12, 0, 12}),
        voicing("D3", "dominant7", {0, 12, 0, 12}),
      })
      :durations(rep(beat * 2.0, 4))
      :instrument("acoustic_piano")
      :volume(0.42)
      :pan(-0.06)
      :velocity(0.44)
      :effect("reverb", "room")
  )
  :add(
    pulse.sequence()
      :notes(line(g3, {1, 5, 8, 5, 6, 3, 5, 1, 4, 8, 10, 8, 5, 3, 5, 4}))
      :durations(rep(beat / 2.0, 16))
      :instrument("pizzicato_strings")
      :volume(0.2)
      :pan(0.18)
      :velocity(0.34)
      :effect("filter", { type = "low_pass", cutoff = 3000.0, resonance = 0.08 })
  )
  :add(
    pulse.sequence()
      :notes(line(g4, {3, 5, 6, 8, 8, 6, 5, 3, 5, 6, 8, 10, 9, 8, 6, 5}))
      :durations(rep(beat / 2.0, 16))
      :instrument("flute")
      :volume(0.27)
      :pan(0.24)
      :velocity(0.4)
      :at(beat)
      :effect("filter", soft_filter)
      :effect("reverb", "chamber")
  )
  :add(
    pulse.sequence()
      :notes(line(g_bass, {1, 5, 6, 3, 4, 1, 5, 5}))
      :durations(rep(beat, 8))
      :instrument("fingerstyle_bass")
      :volume(0.48)
      :velocity(0.56)
  )
  :add_drum_grid(soft_kick(0.26))
  :repeat_times(2)

local lift = pulse.phrase()
  :add(
    pulse.sequence()
      :chords({
        voicing("E3", "min7", {0, 12, 0, 12}),
        voicing("C3", "maj7", {0, 12, 0, 12}),
        voicing("G3", "maj7", {0, 12, 0, 12}),
        voicing("D3", "dominant7", {0, 12, 0, 12}),
      })
      :durations(rep(beat * 2.0, 4))
      :instrument("warm_pad")
      :volume(0.26)
      :velocity(0.36)
      :effect("filter", { type = "low_pass", cutoff = 3600.0, resonance = 0.1 })
      :effect("reverb", "hall")
  )
  :add(
    pulse.sequence()
      :notes(line(e3, {8, 10, 11, 10, 8, 6, 5, 6}))
      :durations(rep(beat, 8))
      :instrument("violin")
      :volume(0.24)
      :pan(0.18)
      :velocity(0.36)
      :effect("filter", string_filter)
      :effect("reverb", "chamber")
  )
  :add(
    pulse.sequence()
      :notes(line(e_bass, {1, 5, 6, 3, 4, 1, 5, 5}))
      :durations(rep(beat, 8))
      :instrument("upright_bass")
      :volume(0.44)
      :velocity(0.5)
  )

local chorus = pulse.phrase()
  :add(
    pulse.sequence()
      :chords({
        voicing("C3", "maj7", {0, 12, 0, 12}),
        voicing("D3", "dominant7", {0, 12, 0, 12}),
        voicing("G3", "maj7", {0, 0, 12, 12}),
        voicing("E3", "min7", {0, 12, 0, 12}),
      })
      :durations(rep(beat * 2.0, 4))
      :instrument("slow_strings")
      :volume(0.34)
      :velocity(0.44)
      :effect("filter", string_filter)
      :effect("reverb", "hall")
  )
  :add(
    pulse.sequence()
      :notes(line(g4, {8, 10, 12, 13, 12, 10, 8, 6, 8, 9, 10, 12, 10, 8, 6, 5}))
      :durations(rep(beat / 2.0, 16))
      :instrument("flute")
      :volume(0.34)
      :pan(0.22)
      :velocity(0.48)
      :effect("filter", soft_filter)
      :effect("reverb", "chamber")
  )
  :add(
    pulse.sequence()
      :notes(line(c4, {5, 7, 8, 10, 8, 7, 5, 3, 5, 7, 8, 10, 12, 10, 8, 7}))
      :durations(rep(beat / 2.0, 16))
      :instrument("violin")
      :volume(0.24)
      :pan(-0.18)
      :velocity(0.38)
      :at(beat)
      :effect("filter", string_filter)
      :effect("reverb", "chamber")
  )
  :add(
    pulse.sequence()
      :notes(line(g_bass, {4, 1, 5, 6, 4, 1, 5, 1}))
      :durations(rep(beat, 8))
      :instrument("fingerstyle_bass")
      :volume(0.5)
      :velocity(0.58)
  )
  :add_drum_grid(soft_kick(0.3))
  :repeat_times(2)

local bridge = pulse.phrase()
  :add(
    pulse.sequence()
      :chords({
        voicing("A2", "min7", {0, 12, 0, 12}),
        voicing("D3", "dominant7", {0, 12, 0, 12}),
        voicing("B2", "min7", {0, 12, 0, 12}),
        voicing("E3", "min7", {0, 12, 0, 12}),
      })
      :durations(rep(beat * 2.0, 4))
      :instrument("acoustic_piano")
      :volume(0.32)
      :pan(-0.1)
      :velocity(0.36)
      :effect("reverb", "room")
  )
  :add(
    pulse.sequence()
      :notes(line(d4, {3, 5, 7, 8, 7, 5, 3, 2}))
      :durations(rep(beat, 8))
      :instrument("flute")
      :volume(0.2)
      :pan(0.22)
      :velocity(0.32)
      :effect("filter", soft_filter)
      :effect("reverb", "chamber")
  )

local final_chorus = pulse.phrase()
  :add(
    pulse.sequence()
      :chords({
        voicing("C3", "maj7", {0, 12, 0, 12}),
        voicing("D3", "dominant7", {0, 12, 0, 12}),
        voicing("G3", "maj7", {0, 0, 12, 12}),
        voicing("E3", "min7", {0, 12, 0, 12}),
      })
      :durations(rep(beat * 2.0, 4))
      :instrument("strings")
      :volume(0.36)
      :velocity(0.46)
      :effect("filter", string_filter)
      :effect("reverb", "hall")
  )
  :add(
    pulse.sequence()
      :notes(line(g4, {8, 10, 12, 13, 12, 10, 8, 6, 8, 9, 10, 12, 15, 13, 12, 10}))
      :durations(rep(beat / 2.0, 16))
      :instrument("flute")
      :volume(0.34)
      :pan(0.24)
      :velocity(0.5)
      :effect("filter", soft_filter)
      :effect("reverb", "chamber")
  )
  :add(
    pulse.sequence()
      :notes(line(c4, {5, 7, 8, 10, 8, 7, 5, 3, 5, 7, 8, 10, 12, 10, 8, 7}))
      :durations(rep(beat / 2.0, 16))
      :instrument("violin")
      :volume(0.26)
      :pan(-0.2)
      :velocity(0.4)
      :at(beat)
      :effect("filter", string_filter)
      :effect("reverb", "chamber")
  )
  :add(
    pulse.sequence()
      :notes(line(g_bass, {4, 1, 5, 6, 4, 1, 5, 1}))
      :durations(rep(beat, 8))
      :instrument("fingerstyle_bass")
      :volume(0.52)
      :velocity(0.6)
  )
  :add_drum_grid(soft_kick(0.28))
  :repeat_times(2)

local coda = pulse.phrase()
  :add(
    pulse.sequence()
      :chords({
        voicing("G3", "maj7", {0, 12, 0, 12}),
        voicing("D3", "dominant7", {0, 12, 0, 12}),
        voicing("E3", "min7", {0, 12, 0, 12}),
        voicing("G3", "maj7", {0, 0, 12, 12}),
      })
      :durations(rep(beat * 2.0, 4))
      :instrument("acoustic_piano")
      :volume(0.3)
      :pan(-0.08)
      :velocity(0.32)
      :effect("reverb", "room")
  )
  :add(
    pulse.sequence()
      :notes(line(g4, {8, 9, 10, 12, 10, 8, 6, 5}))
      :durations(rep(beat, 8))
      :instrument("flute")
      :volume(0.18)
      :pan(0.2)
      :velocity(0.28)
      :at(beat)
      :effect("filter", soft_filter)
      :effect("reverb", "chamber")
  )

local song = pulse.song()
  :tempo(bpm)
  :add_phrase(intro)
  :add_phrase(verse)
  :add_phrase(lift)
  :add_phrase(chorus)
  :add_phrase(bridge)
  :add_phrase(final_chorus)
  :add_phrase(coda)
  :master_effect("reverb", "room")
  :master_effect("eq", "warm")
  :master_effect("limiter", "transparent")

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