Intervals are the distance between 2 notes. On a guitar, we can measure these in terms of frets, where one fret is equal to one semitone. There are 8 intervals, Unison or Root note, 2nd, 3rd, 4th, 5th, 6th, 7th and 8th or Octaves. These intervals span 12 frets or semitomes. The 2nd, 3rd, 6th and 7th intervals consist of both minor and major intervals which are denoted with a 'm' and a 'M' respectively.. The 4th and 5th are considered 'perfect' intervals denoted with a 'P', and the interval between them, the tritone, is considered an augmented 4th, or a diminshed 5th, depending on context, but we will use 'T' and refer to it as the tritone here. The unison, and octace are also considered 'perfect' intervals as well, but in our application we just refer to is as the root note, marked with an 'R'.
When using intervals, the distance remain the same, ie a minor second is always one semitone above the root, but the notes they represent can be moved. Meaning we can change which note we consider the root, but always have the not one above the root be refered to as a minor second, 'm2'. This abstraction allows us to be more general when talking/thinking and playing music, especially on freted instruments which are very shape based. It also allows us to more easily changed keys of songs, or play more complex chords without having to memorize a million shapes. You just need to know which chord tones you want, and understanding where they are on the fretboard will allow you to play exactly what you want.
Note: Use the cogwheel above to open the settings, and change the grips from right to left, or orient in a vertical position.
