F#madd9 chord
F# minor added ninth
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G
F#
G
G#9
A
A#
B
C
C#
D
D#
E
F
F#
G
G#
C
C
C#5
D
D#
E
F
F#
G
G#
A
A#
B
C
C#
E
D#
E
F
F#1
G
G#
A
A#
B
C
C#
D
D#
E
F#
A
G#
Ab3
A#
B
C
C#
D
D#
E
F
F#
G
G#
A
A
3
5
7
10
The F#madd9 chord has the formula 1, b3, 5, 9 with notes F#, A, C#, G#
The minor added ninth chord can be built by taking a minor chord and adding the 9th of the scale. It serves a similar purpose to the minor chord, with the additional ninth extension for flavor.