gtr1- bar1 octave down:
gtr2- bar1 octave down: bar 4 octave up: bar 9 octave down: bar 11 "g" octave up : bar 13 octave down
      bar 21 octave up
gtr3- bar1 octave down: bar 4 octave up: bar 9 octave down: bar 11 octave up     : bar 13-16 "f16"... octave down
      bar 20 "b" octave up
