The now obsolete (and sold second hand for $30-50) Native Instruments KORE and KORE 2 controllers are great hardware for a MIDI control surface. Although NI released a firmware enabling the KORE and KORE 2 to be used as generic MIDI controllers it still require a driver to run on the connected computer. And the latest driver for MAC does not work on latest MacOS releases.
As I was looking for hardware to make a MIDI controller to control Amplitube for my bass guitar playing, I bought a used KORE 2 and started playing with Arduino BLE MIDI on Nordic Semiconductors nRF52840.
The implementation includes a Mega 2560 PRO board and an Adafruit ItsyBitsy nRF52840 Express. Some nice 3D printed caps allow the Bluetooth signals to be broadcast out of the metal enclosure.
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