I have started using tuxguitar, and the tuning has left be confused.
For example I have the option to select B1 to B9 tuning, instead of just B, is this an error or what are the difference between _1 to _9?
For more details check this screen-shot:
The program gives you the ability to choose how many strings you want, and then the tuning of each of these strings.
The numbers 1-9 refer to octaves. So, for instance, you could choose to tune a 12 string guitar by doubling each string at pitch or by doubling each string at an octave higher.
The pitches are named according to Scientific Pitch Notation. Each octave receives a number and each pitch receives a letter.