D#madd9 chord
D# minor added ninth
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>G
F#
G
G#
A
A#5
B
C
C#
D
D#
E
F
F#
G
A#
C
C
C#
D
D#
E
F9
F#
G
G#
A
A#
B
C
F
E
D#
E
F
F#b3
G
G#
A
A#
B
C
C#
D
D#
E
F#
A
G#
A
A#
B
C
C#
D
D#1
E
F
F#
G
G#
A
D#
3
5
7
10
The D#madd9 chord has the formula 1, b3, 5, 9 with notes D#, F#, A#, F
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.