Jazz Chord Voicing Trainer

You have a keyboard.
But what do you play?

See a chord on the staff. Play it on your keyboard. Get instant feedback. That's it — the fastest way to internalize jazz voicings and actually read music.

Download — $14.99 Why this exists
BeingJAZZER app screenshot
THE PROBLEM

Piano lessons teach you to play.
Not to understand what you're playing.

You learn a song, but can't play anything else. Without the sheet music in front of you, your hands don't know where to go.
You see notes on a staff but don't know what chord it is. So you play note-by-note instead of thinking in harmony.
You want to compose or improvise, but you can't voice chords from memory. You know the name "Cmaj7" but your fingers don't.
Lessons cost money and time. YouTube tutorials show you one song at a time. Nothing builds the core skill: seeing a chord, playing it instantly.

The fix is simple:
See it. Play it. Repeat.

BeingJAZZER shows you a chord on the grand staff — the same way you'd see it in any real score. You play it on your MIDI keyboard. It tells you if you got it right. Over time, the connection between notation and fingers becomes automatic.

Real grand staff

Right hand voicing on treble clef, left hand root on bass clef. Exactly how you'll see it in lead sheets and scores.

MIDI input

Plug in your keyboard. See what you play on a separate staff in real-time. No guessing — visual proof of every note.

Instant feedback

Check mode tells you right or wrong immediately. Correct? Auto-advance to the next chord. Wrong? Try again.

Jazz progressions

ii-V-I, ii-V-I-VI, I-VI-ii-V — practice the patterns that actually matter. Random keys to build fluency everywhere.

Metronome

Set a tempo. Chords change on the downbeat. Builds the time pressure that makes practice stick.

28 chord types × 12 keys

Maj7, min7, dom7, dim, aug, 9ths, 11ths, 13ths, altered — with root, 1st, 2nd, and 3rd inversions. 1,320 combinations.

How it works

1

A chord appears on the staff

Random or from a progression. You see the notes — root in bass clef, voicing in treble clef, with key signature.

2

You play it on your MIDI keyboard

Your notes appear in real-time on a separate staff below. You can see exactly what you're pressing.

3

Feedback is instant

In check mode: green for correct, red for try again. With the metronome: chords auto-advance on beat so you keep moving.

4

Muscle memory builds

After days and weeks, you stop thinking. You see a chord on any score and your fingers just know. That's the goal.

One price. No subscription.

Less than one piano lesson.

$14.99
One-time payment · Lifetime updates
28 chord types with all inversions
MIDI keyboard support
4 jazz progression modes
Built-in metronome
macOS & Windows
EN / JA / ZH
Dark & light mode