Reply To: using Arduino Nano

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The Pro Micro is specifically needed in this case because it natively supports the USB HID profile, which is necessary to have the device recognized as a MIDI controller.

In years past you could use a board based on the older Atmel chips and “bit bang” the USB messages but for the most part that no longer works.  You need to use a 32u4 or SAM based board in order to have native HID support.