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I found this incredibly soothing, maybe even therapeutic.

Bravo. Wonderful execution by the creator.

I'd love to hear more about what technology was used to make this. I actually have a web port of my DX7 emulator, but I don't promote it much. I've also been experimenting more recently with a Rust code base for synthesis and am considering picking that up again.
Mind sharing your dx7 port? I'd love to check it out!
Sure, it's https://github.com/google/music-synthesizer-for-android . You probably want the "webaudio" branch.
The JS source is pretty readable; looks hand-coded and lightly minified rather than targeted by some other language, a little help from jQuery and jQuery UI.
Added this as a home screen icon on my iPhone... Barely indistinguishable from a native app downloaded from the App Store. Excellent!
Very nice. It'd be cool to add other scales beyond pentatonic, to.
I love these kinds of grid step sequencers and have had an obsession with them since I saw a Monome as a teenager. I tried to make my own capacitive touch hardware once that could work as one. Eventually I just settled on writing a MIDI Node.js one which works with a Novation Launchpad [1].

This one is really well done and gives me some ideas. Would be cool if it took advantage of bigger screens.

[1]: https://github.com/kasbah/launch-step

Beautiful design! Having trouble with the sound working on Android in Chrome. Looks like site might be getting hugged to death, too.
This is pretty incredible, i love playing with single tone things like this and this is a particularly nice one. It's also fascinating to see how the magic almost completely goes away when i switch to a major key

nice ageisopolis track in there too

Slight nitpick, the sound clips if there's too much going on at once.

having done some stuff with webaudio api I doubt there's much can be done about this right now.
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This is simply great! I love how I can simply input some "notes" and make something decent. Much easier than learning piano!
FYI: There's a bug in the reverb processing; if you listen to the "Ambient" preset for long enough the sound will start clipping in and out and eventually disappear altogether. As soon as I bring Reverb->Amount above zero, I get some nasty quantization noise (mostly in the right signal) and left signal pops in and out with some nasty noise around it.
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Very much like a Yamaha Tenori-On. Nice work.
The Tenori-On iOS app saved my wallet and probably one of the most used apps on my device (other than "Dungeon Raid", a match-three game with RPG elements). $20 dollars for a software version of a $1,000 instrument? YES PLEASE
Such a soothing experience!
A lot of fun. I would add an editing mode where you can switch between patterns without playing them.
Bravo! Thank you for making this, and for sharing it. So cool.
Looks like it would be cool, but consistently crashes the tab for me in Firefox on Windows 10.
I don't know the first thing about music, but this was still fun to play around with. The front end is a work of art. Looks solid and robust.

I tried it on my iPhone (in Safari) it made a sort of clicking sound with every "beat" or whatever it's called when the line passes over the circles. Other than that, looks great even on iPhone.

Nice idea to provide only notes from a chord! It's really motivating if you never made music before. ("Wow I can do this!")
aaahhh that's why it sounded right. I'm disappointed :-)
Would you mind explaining the mechanics of this in more detail? I too was wondering why whatever I did seemed to sound good.
All the notes are from a single scale. You pick one of two available scales, the "major" and "minor", which in this case are the Pentatonic major and minor scales respectively. That it has 5 tones is obvious since you might notice that each tone is repeated 5 steps above, in the next octave up.

https://en.wikipedia.org/wiki/Pentatonic_scale#Major_pentato...

The reason this scale is so popular for this type of music device - "penatatonic sequencers" - is because it's almost impossible to screw up. So you could describe using the pentatonic scale as removing some of the opportunity for making the music more interesting, but in return you almost completely eliminate any opportunity to make it "sound bad". Any note can follow any note in the pentatonic scale, which is why "randomize" or handing it to a child (which is the same thing) works as a creation method.

Nice! The minimalistic UI just encourages you to experiment and just click things around.
Cool! I made https://www.tones.fm/stfwn/5-min in 5 min! I really like the simplicity. I subscribed and I'm curious to see how you will add more features while sticking with the look and feel that makes this original and nice.
Maybe I'm blind, but is there a way to create an original composition? I tried clicking "Create" but it doesn't seem to do anything. Is it also possible to save the music we create?
Edit > Clear
Yes, I noticed that, but then the music I create is still classified as a remix of the original track that I cleared.
when you go to save, you can change the name. This is sufficient, I believe.
Really nice, and works excellent on mobile. One minor grudge: the notes seem to be just a tad small for touch on mobile.