Hexagonal keyboard layout with:

• Pitch layed out horizontally, the different scales vertically.
• All basic chords on one line from the root note, going to the right.
• Major chords starting on the rows with uppercase notes: major, maj7, 7/9/11/13 etc.
• Minor chords starting on the rows with lowercase notes; minor, m7, m7/9/11/13 etc.
• sus2 and sus4 variants above and below the third.
• All the notes from a major scale conveniently together.
• Enough room on an iPad screen for 3.5 octaves, with comfortably sized keys.
• This sequence of chords can be played by moving one finger one key down-right repeatedly:
  F♯—D♯m—B—G♯m—E—C♯m—A—F♯m—D—Bm—G—Em—
  C—Am—F—Dm—B♭—Gm—E♭—Cm—A♭—Fm—D♭—B♭m—
  (The circle of fifths alternating with the relative minors.)
  The same sequence, but instead the maj7 4-finger variants,
  can be played by moving one finger down-left repeatedly.
• Works well with other tonal systems: 5edo, 7edo, 9edo, 12edo, 17edo, 19edo, 24edo,
  31edo, 50edo, 55edo, 72edo
• Playable with mouse and, even better, also with multi-touch!
  Try dragging horizontally to play like a harp.
• MIDI out uses MPE mode with a pitch bend range of 12.
• Playable with the AXiS-49 controller in selfless mode.
• Playable with the Launchpad Mini controller. Try it out!
• Playable with the Lumatone. Try it out!

It's basically a mix between C-thru-music's axis controllers and Audanika's SoundPrism.

I would love to have an iPad midi controller app with this layout!

Sjoerd Visscher