- - selected string or selected tone
- - tone of the same pitch
- - one octave lower tone
- - two octaves lower tone
- - three octaves lower tone
- - one octave higher tone
- - two octaves higher tone
- - three octaves higher tone
It's easy:
You select a string by clicking on it (it will become red). You can immediately see on the other strings where to press them for tuning. If you click on the selected string once more, you'll see corresponding tone on all other strings. To undo clicking, click with the right button wherever on the fingerboard.