how to programmatically organize the transmission of a note or CC by pressing such a matrix of buttons ?
Give every button an integer number and send the numbers?
It doesn't work gives us no useful information.
There are tutorials showing how to read button matrixes. Look around there and get the know how, which circuitry to use, and "how to".
Control Surface's multiplexer classes do not support the digitalWrite function. This is by design, because multiplexers offer no way to mimic the persistent behavior of "actual" I/O pins.
You can easily scan the matrix yourself, though, see e.g. Control-Surface/src/AH/Hardware/ButtonMatrix.ipp at main · tttapa/Control-Surface · GitHub
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