I have made a weird musical instrument. It is some kind of electronic just intonation kalimba I guess? With stars?

I have zero musical skills so I made it pentatonic, which means I can just bash keys at random and it will sound quite pleasant.

For the technical details, it's built around a Sipeed Longan Nano microcontroller module, connected up to a small amplifier, some little pill box speakers, and a bunch of microswitches. The microcontroller itself is a GD32VF103, a weird Chinese creation of dubious legality that stuffs a RISC-V core into a clone of an STM32F103 to replace the original ARM core.

It's pretty fast, and can run the built-in tiny LCD at 60 FPS along with 10 voices of Karplus-Strong synthesis.

I love the Karplus-Strong algorithm, it is a completely bullshit way to simulate a stringed instrument cheaply: en.wikipedia.org/wiki/Karplus–

It can be a bit tricky to tune that algorithm since in its simplest form it can only be tuned to integer divisions of the audio frequency. Using just intonation helps here!

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@WAHa_06x36 this algorithm makes no sense and yet it appears to produce pretty good results
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