A(♯4) 7-string guitar chord

How to play A(♯4) on 7-string guitar

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

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

What notes are in A(♯4)?

A(♯4), A major with sharp four, no fifth, is A, C♯ and D♯: the root (A), the major third (C♯) and the augmented fourth (D♯). Its formula is 1 3 ♯4.