Since I'm entering this in the Hackaday Prize, I have to write up a bunch of stuff I wouldn't ordinarily bother with.

From the rules:

1. Discuss the challenge the project addresses.
2. Discuss how the project will alleviate or solve the problem that the project addresses.
3. Publish at least one (1) image illustrating how the project might be used. This may be a sketch, schematic, flow chart, rendering, or other type of image.

This project meets many challenges.

• Real music synthesizers that let you build your own sounds are kinda expensive. 
  • This one will be cheaper. The BOM works out at about $15. I intend to sell it for a lot more than that, because I need to eat, but it will still be cheap in comparison to similarly powerful units.
• The ones that are semi-cheap are usually not very powerful.
  • I'm going to give you real synthesizer stuff like filters, envelopes, adjustable waveforms, multiple oscillators, etc. You'll be able to save sounds to the internal memory on the CPU. I hope to even allow for a tiny sequencer and maybe a drum loop.
• The ones that are semi-cheap are kinda hard to use.
  • This one should be very easy. 
    • To select a different sound, tap on "Patch" and tap on a key to load that patch. 
    • To  write a patch to memory, tap on "Write" and tap on a key to save over that slot.
    • To edit a sound, tap on "Value" tap on a key to select a value. Release for a second, and then tap on another key to change the value to the number of the key. It will play the sound. Tap on "Value" again to stop changing the value.
    • To change to a different mode (Sequencer, Drums, Blinky Lights), tap on "Mode" then tap on a key to change to that mode. 
    • Hopefully all that is simple?
  • Having a stylus keyboard arranged as a traditional piano keyboard with at least two octaves of notes means that it is much easier to actually play real songs that sound like actual music that mundane humans enjoy, as opposed to random fart noises and out of tune screeching sounds most often made by non-keyboard synthesizers.
• A lot of small synthesizer projects require you to have an amplifier or headphones to hear it through.
  • This one has a built in amplifier and speaker.
• Not everybody knows that you are an ace synthesizer player.
  • This synthesizer is worn as a belt buckle, and a very large one at that!
  • It has a giant flashing, spinning LED ring that can be set to perform a light show when it is not performing music. Everybody can see you coming a mile away, and will all be looking at your crotch.
  • Synthesizer is attached to the belt in a way that can be quickly and easily removed and used to rock people out in the most efficient manner possible.
• Convention swag badges often look pretty, but rarely do anything useful.
  • This one plays music. (You thought I was going to say "goes to 11" didn't you?)

Are those enough challenges and solutions?

I also need a diagram illustrating how the project might be used. It seems really obvious to me, and I'm not sure how a diagram helps, but  ok.

I hope that does the job! Please let me know if something more is necessary.

The last thing I need is a 2 minute video. But it is after 6am and I'm tired. Maybe tomorrow or Friday?