Aaug 7-string bass chord

How to play Aaug on 7-string bass

The most common way, the first shape above: your little finger on the D string at the 3rd fret, your ring finger on the G string at the 2nd fret and your index finger on the C string at the 1st fret. Let the A and F strings ring open. Don’t play the B and E strings.

From the B string x x 0 3 2 1 0 (x: not played, 0: open)

What notes are in Aaug?

Aaug, A augmented, is A, C♯ and E♯: the root (A), the major third (C♯) and the augmented fifth (E♯). Its formula is 1 3 ♯5.

Why do Aaug and two other augmented chords have the same notes?

An augmented chord is two major thirds stacked, A, C♯ and E♯, and a third more brings you back to A. So Aaug has the same notes as the augmented chords on C♯ and E♯.