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Amazon.com: LEKATO USB Type-C MIDI Interface MIDI Cable Adapter with Input & Output Connecting with Keyboard/Synthesizer for Editing & Recording Professional MIDI Adapter Cord with Windows/Mac for Studio -6.5Ft : Musical Instruments
Make Your Own Cheap USB MIDI Controller or Keyboard : 4 Steps - Instructables
Arduino USB MIDI Interface : 10 Steps - Instructables