I see this comment has been upvoted.

Really, it is just a keyboard with an extra dimension. (The ‘circle of sevenths’ follows, on the chart diagonally through the whole, the pattern of b&w keys on a standard keyboard; i marked it with the small raised b&w bullets.)

The keyboard app i made it for – the newest fork / release of it, at least – supports chords, as well as playing triads with a single tap, if you tap a vertex within a configurable distance.

The rest is just, well, knowing the stuff you want to play. (I made the chart so that it helps me with this part.) The intervals and degrees are marked.

Here are the links to the libre apps’ binaries:

https://github.com/lrq3000/hexiano/releases/tag/v1.0.2

https://apkpure.com/designoverlay/com.ms_square.android.design.overlay/download (Github page has no releases; can’t vouch for this site, disabled internet permission for this download myself)

Edit: i suppose my point is, it is literally not any harder than the regular keyboard to play. Because the ‘circle of sevenths’ and ‘the circle of seconds’ literally are the standard keyboard in the first place.

Even if my markings were all confusing, which would be fair to say, they would still at most result in a standard keyboard with, well, an added piece of graffiti on top of it. You can just ignore them.

Left/right is semitones, up/down is fifths.

Edit: i got confused there for a second. My words weren’t wrong, as such, and the chart is correct; the diagonal line indeed represents the standard keyboard layout. But for a moment, here in the thread, i thought / replied as if it were a direct one, eg. in steps of semitones. Of course it is not so; that line is in steps of sevenths, which i briefly forgot of.

But still, my point stands that the underlying keyboard is very simple. It just goes left to right, then wraps around bottom to top, intuitively. On the very bottom and the very top of it, you can see black boundaries of the standard 88 key piano range.

As i said in a Tumblr note, this is really a companion pic for a pair of (libre) apps called ‘Hexiano’ and ‘DesignOverlay’.

https://github.com/lrq3000/hexiano

https://github.com/Manabu-GT/DesignOverlay-Android

Hahah. Well, incidentally, i did just a few weeks ago come across a thing called ‘Adomah periodic table’ and downloaded it.

Also, believe me, i made it because i struggle with music, hard. I don’t know what a music key is. Despite spending many days on this chart, i still can hardly remember which direction which intervals go, especially ‘backwards’, ‘left’.

I can’t read the musical staff. I abhor that it doesn’t consistently map distances to pitch differences. I can’t memorize conventional chord names.

I made it because, well, with visualization everything is easier. (The ‘tonnetze’ are an old invention, though should be more known.)

So i, well, tried to visualize as much as i could.

But fair, here is some info (though do you think if i were good with words, i’d make a visual chart?).

An octave is divided into twelve semitones, right. So octaves are the filled tiles.

And the important thing is, this is a ‘slope’. Like a piece of paper held at an angle. As you can see, going right, it only takes three steps (of four) to get to 12 / octave, but four of three to the left. A ‘visual perspective’ thing. (Thence also the lean of the cross.)

So, on the bottom, you have the intervals. And this is an ‘isomorphic keyboard’, meaning every musical entity corresponds, unlike on the regular keyboard, to the very same hand motion (important for my poor memory; i once read piano players memorize far more motions than they could have).

Also, it is a torus, meaning, notes wrap around. Thence the equality sign on both red tonics. It’s the same pitch.

The pink stripe is an infinite (really) octave. On this chart, beyond the screen, every note occurs an infinity of times. This also means there’s infinity of gestures to play any interval. Eg. you can play the P4 by going upright-right, but also up-left-left.

What else… chords are simultaneous presses of tiles, of course.

My terms for (musically relevant) color groups are, in octave order: intervals, semitones, scales / modes, the octave, chords, scale degrees, and ‘patterns’ (mapped at intervals from the yellow tonic are patterns of qualities (major, minor, … ) you go through going by those intervals till you meet an octave).

The left colored column is the circle of fifths.

That’s an intro.

Edit: the ‘raised’ ‘islands’ are the white keys of the piano, and the depressed ‘straits’ are black.

Edit: also, the thick arrows are the order of, hm. Of white keys, i imagine. But simultaneously, of course, of interval values, scale degrees, etc.