Short answer: A#mM7b9 is a A# Minor Major 7♭9 chord with the notes A♯, C♯, E♯, G♯♯, B. In citternE Five string - ingnore first E tuning, there are 0 voicings. See the fingering diagrams below.
Also known as: A#m#7b9, A#-M7b9, A#−Δ7b9, A#−Δb9
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