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A chord generator lib for guitar-like instruments
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kjell/chords
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Chords ====== A chord generator lib for guitar-like instruments. Using via gem (hosted at gemcutter.org) --------------------------------------- $ sudo gem install chords $ chords -h Running irb under chords/lib: ----------------------------- >> require 'chords' => true >> include Chords => Object >> Fretboard.standard.print E.major, :duplicates => 3, :max_fret_distance => 2 E: --0----0----0----0---12----7----0---12----7-- B: --9----0----0---12---12----9---12---12----9-- G: --9----9----1---13---13----9---13---13----9-- D: --9----9----2---14---14----9---14---14----9-- A: -11---11----2---14---14----7---14---14----7-- E: --0----0----0----0----0----0---12---12----7-- Total 9 fingerings. => nil >> Forked to work for mandolins? ====== (—kjell, 3/18/2010) I don't particularly know what I'm doing, but I threw in a new chord finding algorithm that I like better and I hope isn't completely broken. Tests probably all fail. I'm using it to find mandolin chords and it's working to my liking. It doesn't respect the order of the notes, so when you ask for a G.major it hands back G.major (G, B, D) and what I believe are the first (B, D, G) and second (D, G, B) inversions. I know nothing of music theory, to me a G chord is all of the three above. (In fact to me a G chord is the shape my fingers make starting at a particular spot on the fretboard, helas.) I'm using it like this: require 'chords' include Chords Fingering::DEFAULT_MAX_FRET_DISTANCE = 7 # Mandolins have teeny frets and 4 strings DEFAULT_FRETBOARD = mando = Fretboard.new([G.new(1), D.new(1), A.new(2), E.new(3)], 17) %w[C.major E.major.seventh A.major.seventh D.major.seventh F.major G.major.seventh].each do |c| puts c mando.print(eval(c)) puts end
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