off_ramp.rb

use_bpm 110

## define sounds

define :play_kick do |vol|
  sample :bd_haus, amp: vol * 1.4, beat_stretch: 0.4
end

define :play_tom do |vol|
  with_fx :reverb, room: 0.7 do
    sample :drum_tom_lo_soft, finish: 0.2, cutoff: 75, amp: vol
  end
end

define :play_snare do |vol|
  sample :drum_snare_soft, amp: vol
end

define :play_hats do |vol|
  sample :drum_cymbal_closed, amp: vol * 0.6
end

define :play_bass do |note, vol|
  synth :saw, note: note, cutoff: 70, attack_level: 2, release: 0.3, res: 0.2, detune: 0.15, amp: vol * 0.4
  synth :dsaw, note: note, cutoff: 70, release: 0.3, detune: 0.15, res: 0, amp: vol * 0.4
end

## functions

define :beats do |drum, trigger, at, vol|
  ## the function takes as parameters:
  ## drum = which instrument (drum) to use
  ## trigger = whether the index number or kick (on or off-beat) triggers the drum
  ## at = which indeces or kicks triggers the drum
  ## vol = volume
  
  if at.include? trigger
    send(drum, vol.call)
  end
end

define :interval do |kick, swing_pct|
  ## defines interval time and adds swing
  
  if (swing_pct < 50)
    delay = 0
  else
    delay = (swing_pct - 50) * 0.005
  end
  
  if(kick % 2) == 0
    #  off beats need to be slightly late for swing
    sleep (0.25 - delay)
  else
    sleep (0.25 + delay)
  end
end

## set volume categories (more human feel than using fixed volume settings)
ghost = -> { rrand(0.4, 0.6) }
normal = -> { rrand(0.8, 1.2) }
accent = -> { rrand(1.6, 1.8) }

## live loops

live_loop :drumbeat do
  #drum sequencer
  define :play_beat_bar1 do
    
    [1, 2, 3, 4, 1, 2, 3, 4, 1, 2, 3, 4, 1, 2, 3, 4].each.with_index(1) do |kick, index|
      
      beats(:play_kick, kick, at = [1], normal)
      beats(:play_kick, kick, at = [4], ghost) if rand < 0.2
      beats(:play_hats, kick, at = [3], normal)
      beats(:play_tom, index, at = [7], normal)
      beats(:play_tom, index, at = [15], normal) if rand < 0.1
      beats(:play_snare, index, at = [5, 13], accent)
      beats(:play_snare, index, at = [16], ghost)
      beats(:play_hats, kick, at = [1,2,3,4], ghost) if rand < 0.4
      
      interval(kick, 60)
      
    end
  end
  
  define :play_beat_bar2 do
    #drum sequencer
    [1, 2, 3, 4, 1, 2, 3, 4, 1, 2, 3, 4, 1, 2, 3, 4].each.with_index(1) do |kick, index|
      
      beats(:play_kick, kick, at = [1], normal)
      beats(:play_kick, kick, at = [4], ghost) if rand < 0.2
      beats(:play_hats, kick, at = [3], normal)
      beats(:play_tom, index, at = [7], normal)
      beats(:play_tom, index, at = [15], normal) if rand < 0.3
      beats(:play_snare, index, at = [5, 13], accent)
      beats(:play_hats, kick, at = [1,2,3,4], ghost) if rand < 0.4
      
      interval(kick, 60)
    end
  end
  
  with_fx :lpf, cutoff: 110 do
    play_beat_bar1
    play_beat_bar2
  end
end

live_loop :bass, sync: :drumbeat do
  tick
  riff_1 = [:f2, :gs2, :c2]
  riff_2 = [:d2, :f2, :a1]
  32.times do
    play_bass (knit riff_1.choose, 4, riff_2.choose, 4).look, ghost.call if (spread 6, 11, rotate: 3).tick (:spread)
    sleep 0.25
  end
end

live_loop :zawa do
  #stop
  tick
  sync :drumbeat
  12.times do
    synth :zawa, wave: 0, phase: 0.8, release: 4, amp: 0.06, note: (knit :f3, 4, :d3, 4).look, cutoff: (line 60, 120, steps: 6).look
    sleep 0.5
  end
end


live_loop :piano, sync: :drumbeat do
  tick
  use_synth :piano
  f = (scale :f, :mixolydian).pick(8)
  d = (scale :d, :mixolydian).pick(8)
  r1 = [[0.25, 0.5].choose, [0, 0.25, 0.5, 1].choose, [0.25, 0.5].choose] #sets the first three intervals randomly from the given options
  r2 = r1 + [2 - r1.sum] #sets the last interval to add up to 2 beats
  with_fx :reverb, room: 0.7, mix: 0.5 do
    with_fx :lpf, cutoff: 80 do
      play_pattern_timed (knit f, 16, d, 16).look, r2, release: 0.3, attack: 0.05, amp: normal.call
    end
  end
end


live_loop :piano_2, sync: :drumbeat do
  tick
  use_random_seed 102
  use_synth :piano
  f = (scale :f, :mixolydian).pick(8)
  d = (scale :d, :mixolydian).pick(8)
  r1 = [[0.25, 0.5].choose, [0, 0.25, 0.5, 1].choose, [0, 0.25, 0.5].choose]
  r2 = r1 + [2 - r1.sum]
  with_fx :reverb, room: 0.7, mix: 0.5 do
    with_fx :lpf, cutoff: 80 do
      play_pattern_timed (knit f, 16, d, 16).look, r2, release: 0.3, attack: 0.05, amp: normal.call
    end
  end
end