This site insisted on having write access to my connected MIDI devices, which is a bit concerning as it's not required for what the site actually does.

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altho123 an hour ago | parent [-]

They're asking for midi device control & reprogram, my guess is that for some of the exercises you can use your own midi keyboard to input the note (dictation etc.)

	▲	dwringer an hour ago \| parent [-]
		I figured the same, but I did not encounter such exercises, and regardless having the ability to send sysex to my MIDI devices is not required for such a thing.