Play Seventh Chords on Gesture Synth

Map Three and Four Fingers to Seventh Colours

Select degree I in the major world and raise three right-hand fingers for Gmaj7. Move to degree IV with the same right-hand shape for Cmaj7. For D7, select degree V and raise four right-hand fingers. The extra finger changes the quality index; it does not simply make the chord louder.

For Em7 and Am7, the left hand must select the minor world while the right hand returns to three fingers. Watch the world and quality indicators independently. A correctly recognized three-finger shape can still produce the wrong chord family if the wrist-world control is unstable.

• Three fingers + major world: major-seventh colour.
• Three fingers + minor world: minor-seventh colour.
• Four fingers + major world: dominant-seventh colour.
• Four fingers + minor world: diminished-seventh colour.

Run the G-Major Seventh-Chord Sequence

The drill begins Gmaj7–Cmaj7–D7–Em7 and repeats the main contrast before adding Am7 and a final D7–Gmaj7 resolution. Hold each target until all four match chips confirm. Keep the thumb relaxed so the chord remains in the normal octave and place the right hand at a moderate height for comfortable volume.

Practise the first four targets without the metronome. When you can name the required degree, world and finger count before moving, enable the 68 BPM click. Slow preparation matters more than finishing the sequence quickly.

Learn degree and chord-world theory → · Compare root and inversion shapes →

Listen for Function, Not Just Finger Count

Compare the open colour of Gmaj7 with the stronger pull of D7 back toward G. Then compare Gmaj7 with Em7: both use three right-hand fingers in this mapping, but a different degree and chord world create a different harmonic result. The hand shape is an input, not the musical explanation by itself.

Use the chord-progressions page to record a short ii–V–I or IV–V–I experiment after the drill. The browser synth generates the displayed voicing, but it does not grade composition quality or claim that every seventh chord suits every musical context.

Record a four-chord loop → · Open the focused chord player →

Correct Seventh-Chord Tracking Problems

If D7 appears as a simpler chord, the camera may not see all four raised fingers. Spread them slightly, face the palm toward the camera and avoid the edge of the frame. If Em7 appears major, stabilize the left wrist world before changing the right hand. If sound is harsh or loud, lower master volume rather than hiding fingertips.

Track one failure category at a time: wrong degree, wrong world, wrong quality or wrong octave. This makes a missed target actionable and prevents random hand changes from solving one property while breaking another.

Fix camera and hand recognition →