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InfluxDB
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There are a lot of USB MIDI projects that are easier with a Leonardo or Micro or a Teensy, but I believe you can set up an Uno for USB MIDI? Last I looked, you had to reprogram the USB chip on it for this, which is a little scary, but it's doable; here is a project that lets you do that and which can go back to normal mode (for uploading new Arduino code) without re-reprogramming the USB chip every time.
NOTE:
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Hence, a higher number means a more popular project.