Voicing of F# Half Diminished

Rooted I

Back to F#m7b5

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Left hand
F#3A3C4E4
Family
4-Note Rooted

The Rooted I voicing of F#m7b5 stacks F#, A, C and E from the bottom up: the root, minor 3rd, flat 5th and minor 7th of the chord.

It's one of the 4-Note Rooted voicings: four-note voicings with the root on the bottom or inside, in the left hand. The other for F#m7b5 is Rooted II.