Sonic Pi script to auto-accompany a melodic line every four notes. Goes well with the idea that accompaniment would yield to a melody. https://en.wikipedia.org/wiki/Tempo_rubato#.22Accompaniment_yields.2Fadjusts_to_melody.22

rubato_synthdrome.rb

use_real_time # Preventing latency
use_tuning :just, :c # Just Intonation
bass = (ring 48, 53, 48, 43, 53, 48, 55, 41) # Alternating between C, F, and G
with_fx :compressor, threshold: 0.1 do # Preventing clipping
  with_fx :reverb do # Everything on the same reverb
    melody = synth :prophet, note: 0, release: 1000, cutoff_slide: 0.02, amp: 0
    live_loop :notes do
      note_on, velocity = sync "/midi/USB_Midi_Cable/4/1/note_on" # Incoming notes from Yamaha WX-11 wind controller
      if velocity > 0 # Only use actual note-ons
        control melody, note: note_on, amp: velocity / 127.0 # Incoming note
        if tick(:bar)%4 == 0
          synth :tech_saws, res: 0.1, cutoff: 80, note: bass.tick(:bass), release: 1.2, amp: velocity  / 200.0 # Tanpura-style bass
        end
      end
    end
    live_loop :windy do # Use the incoming breath control, MIDI CC#2, to modulate the low-pass filter
      control_change, breath = sync "/midi/USB_Midi_Cable/4/1/control_change"
      if control_change==2
        control melody, cutoff: breath
      end
    end
  end
end