ninth sharp eleven chord generator
Build and Listen to Ninth Sharp Eleven Chords
C9(sharp11) extends the dominant ninth C, E, G, B-flat and D with F-sharp. The full six-note reference retains the perfect fifth G. Its minor seventh B-flat distinguishes it from a major-ninth sharp-eleven chord.
Compare C9(sharp11) with C9 to remove F-sharp. Hear E and B-flat to confirm the dominant core, then isolate the upper F-sharp. With root F, verify F, A, C, E-flat, G and B.
Play the instrument ↑- Chord formula
- 1 · 3 · 5 · ♭7 · 9 · ♯11
- Semitone offsets
- 0 · 4 · 7 · 10 · 14 · 18
- C reference
- C · E · G · B♭ · D · F♯
- Sound
- Sine reference · A4 = 440 Hz
Dominant ninth with an augmented eleventh
C9(sharp11) extends the dominant ninth C, E, G, B-flat and D with F-sharp. The full six-note reference retains the perfect fifth G. Its minor seventh B-flat distinguishes it from a major-ninth sharp-eleven chord.
C9(sharp11) is different from C7(flat5): the current collection retains G and adds both D and F-sharp. It is also different from Cmaj9(sharp11), whose seventh is B natural.
- Degree 1 is 0 semitones above the root in this reference.
- Degree 3 is 4 semitones above the root in this reference.
- Degree 5 is 7 semitones above the root in this reference.
- Degree 7 is 10 semitones above the root in this reference.
- Degree 9 is 14 semitones above the root in this reference.
- Degree 11 is 18 semitones above the root in this reference.
A listening test for 9(♯11)
Compare C9(sharp11) with C9 to remove F-sharp. Hear E and B-flat to confirm the dominant core, then isolate the upper F-sharp. With root F, verify F, A, C, E-flat, G and B.
The Compare dominant ninth button retains your chosen root and octave and plays the comparison in root position. Set the current chord to root position for a direct comparison. The note buttons let you isolate the chord member that makes this quality different.
Follow the selected bass through each voicing
This 6-tone reference offers 6 positions. Root position starts with degree 1; First inversion starts with degree 3; Second inversion starts with degree 5; Third inversion starts with degree 7; Fourth inversion starts with degree 9; Fifth inversion starts with degree 11. The bass suffix beneath the chord symbol identifies the actual lowest tone.
Root position preserves compound ninths, elevenths and thirteenths at their original height. The inversion selector first moves the extensions into one octave, sorts by sounding pitch and rotates from the selected degree. These close pitch-class study voicings are different from the complete extended root-position stack; they are not recommended jazz fingerings.
A dominant ninth with sharp eleven can supply an altered upper color while keeping the natural ninth. Some performance voicings omit the fifth. This explicit stack keeps it, so the neighboring G and F-sharp are visible rather than silently simplified.
Check C, F and A before transposing further
Begin with C and confirm C · E · G · B♭ · D · F♯. Use the F and A example buttons to transpose the same interval collection. Follow the MIDI values if an enharmonic spelling looks unfamiliar: changing the root shifts every sounding note by the same interval.
Use Root octave 2 for a lower reference or octave 5 for a higher one. A root change keeps your selected voicing; the example buttons return to root position. Reset restores C, octave 3 and root position. Stop sound ends the currently active chord or arpeggio.
What playback and the WAV file contain
The displayed notes are synthesized locally using sine waves after your click. The tool does not create a progression, transcribe a song, provide guitar fingering or simulate an acoustic instrument. No camera, microphone, registration or file upload is needed.
Download WAV saves the currently displayed voicing as a 2.4-second mono PCM file at 44.1 kHz with a short fade. It does not export the comparison chord or an arpeggiated performance. If Web Audio is unavailable, the note display and WAV download remain usable.
Theoretical note names preserve each degree and may use double accidentals. Equal-tempered playback gives enharmonic notes the same frequency. This browser tool does not add new extended-chord gestures to the webcam instrument; that instrument has its own triad, inversion and seventh controls.
Play the separate gesture instrument → · Local processing and privacy →
Answers before you play
Ninth Sharp Eleven Chord Questions
What are the notes in C ninth sharp eleven?
C · E · G · B♭ · D · F♯. The formula is 1 · 3 · 5 · ♭7 · 9 · ♯11, with semitone offsets 0, 4, 7, 10, 14, 18. These are the complete notes sounded by this generator in root position.
How does this differ from dominant ninth?
Compare C9(sharp11) with C9 to remove F-sharp. Hear E and B-flat to confirm the dominant core, then isolate the upper F-sharp. With root F, verify F, A, C, E-flat, G and B.
Are these standard performance voicings?
A dominant ninth with sharp eleven can supply an altered upper color while keeping the natural ninth. Some performance voicings omit the fifth. This explicit stack keeps it, so the neighboring G and F-sharp are visible rather than silently simplified. The tool states its complete formula and uses close pitch-class rotations for inversion study. Performance omissions and spacing depend on the instrument and musical context.
Can I play and export without a camera?
Yes. Click Play chord or Play arpeggio for local audio. Download WAV saves the displayed chord even if live audio is unavailable. Camera and microphone permission are never requested.
Why does the displayed accidental look unusual?
C9(sharp11) is different from C7(flat5): the current collection retains G and adds both D and F-sharp. It is also different from Cmaj9(sharp11), whose seventh is B natural. Note letters follow chord degrees; MIDI numbers show the actual pitches at A4 = 440 Hz.