it's been a few years since i used arduino, and i had to brush on a few basics to find my feet again.
i think it would be fantastic if you folks could habitually include some more examples in your reference material, eg. pinmode.... could have an example declaring digital and analog pins as outputs, so i don't have to keep searching to discern that while analog pins are referenced as A#, digital pins are not D# but just #.
i don't think it would kill anyone if you included examples for "all four cases". sometimes people like to do things while their thoughts are belaboured with other issues in life. making things simple and tangible helps.
simple examples like this would facilitate the rate of progress for the aspiring nescient.
while referencing MIDIUSB i was only lucky in searching to discern that the bytes are internally declared so i wouldn't have to write my own decomposition. if i hadn't been doing this for decades, i could only imagine the amount of frustration someone would have to go through until they can turn this simple library into an functioning routine. then people would write more stuff themselves instead of all the borrowing one sees instead of individual work.