Great sound!

This Sonic Pi example really blew my mind when I first heard it. Such a rich sound out of three notes.

    use_synth :hollow
    with_fx :reverb, mix: 0.7 do
    
      live_loop :note1 do
        play choose([:D4,:E4]), attack: 6, release: 6
        sleep 8
      end
    
      live_loop :note2 do
        play choose([:Fs4,:G4]), attack: 4, release: 5
        sleep 10
      end
    
      live_loop :note3 do
        play choose([:A4, :Cs5]), attack: 5, release: 5
        sleep 11
      end
    end