F4+♭1

F major fourth, add flat root

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MSK 007 Leapfrog VCF (patch; see in online store)
MSK 009 Coiler VCF (patch; see in online store)

Equivalent chord symbols: F4+♯7, E♯4+♯7, E♯4+♭1, Asus2♭2+♯5, Esus4♭5+♯1, F♭sus4♭5+♯1.

Notes in this chord: F♭, F, A, B♭. Integer notation: {4, 5, 9, 10}.

Keys in which this chord fits with enharmonic spelling: FM, E♯M, Dm

Nearby chords (one less note): F4, A5+♯5, Asus2♭2, B♭sus4♯4.

Nearby chords (one more note): F+4+♭1, A+♯1+♯5, B♭+♯4+♭1, F4+♯1+♯7, Edim+4+♯1, F♭♭5+4+♯1, Esus4+♯1+♯4, E♭sus2+♯1+♯4.

Parallel chords (same structure, different root): C4+♭1, D4+♭1, E4+♭1, G4+♭1, A4+♭1, B4+♭1, C♭4+♭1, D♭4+♭1, E♭4+♭1, F♭4+♭1, G♭4+♭1, A♭4+♭1, B♭4+♭1, C♯4+♭1, D♯4+♭1, E♯4+♭1, F♯4+♭1, G♯4+♭1, A♯4+♭1, B♯4+♭1.

Experimental fretting charts for guitar standard EADGBE tuning (change tuning or instrument):

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