> it might be helpful to indicate the chord shapes You can select notes on the innermost ring in the circles. For example, select G as the base in the middle

> it might be helpful to indicate the chord shapes You can select notes on the innermost ring in the circles. For example, select G as the base in the middle ring. Then select 1, M3 and 5 on the innermost ring. The fretboard will show you all the possible ways to finger the G major chord.