C sharp major, add sharp fourth

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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: C♯+♭5, D♭+♯4, D♭+♭5, C♯+♯11, D♭+♯11, Fm♯5+2.

Notes in this chord: C♯, E♯, F♯♯, G♯. Integer notation: {1, 5, 7, 8}.

Keys in which this chord fits with this spelling: G♯M, E♯m

Keys in which this chord fits with enharmonic spelling: A♭M, Fm

Nearby chords (one less note): D♭, D♭♭5, F2+♯2, D♭sus4♯4.

Nearby chords (one more note): D♭6+♯4, D♭7+♯4, D♭+2+♯4, D♭+4+♯4, D♭+♯1+♯4, D♭+♯2+♯4, D♭+♯4+♯5, D♭+♯4+♭1.

Parallel chords (same structure, different root): C+♯4, D+♯4, E+♯4, F+♯4, G+♯4, A+♯4, B+♯4, C♭+♯4, D♭+♯4, E♭+♯4, F♭+♯4, G♭+♯4, A♭+♯4, B♭+♯4, D♯+♯4, E♯+♯4, F♯+♯4, G♯+♯4, A♯+♯4, B♯+♯4.

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