AKA: Ab9 sus4, Ab ninth suspended fourth, Ab9sus, Ab nine suspended, Ab Dominant ninth suspended 4
A ninth suspended fourth chord is the best option available on the Stradella system to play a suspended chord.
It’s very similar to a ninth eleventh chord but it does not have either the 3rd nor the 5th and the 11th is seen as a 4th.
A♭, D♭, G♭, B♭
R, 4°, m7°, 9°
A♭ + G♭M
(G# + F#M)
2 + 4
3 + 5