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Solved my issue. 1 needed to use pinMode(pin_In_Mux3, INPUT_PULLUP); on setup then add a delay(5) after digital[i].update

Should of said I am using a 2.0 for this test

It seems that the digital section of this is outputting all the notes when any button is pressed form the circuit I am testing. I have each button wired directly into the MUX inputs then the other...

I looked into this with CD4501 from TI. About 50 cents a chip and can achieve the same thing result for less cost I think.

I have only used the 2.0 before so thats why. I did make a schematic for using the 2.0++ and 8 multiplexers to get to 64 inputs but I worry about voltage drop. The boards only need to be 8 bit...

I am working a project to make a midi controller with 64 analog inputs. I was wondering if their is a way to either connect multiple teensy 2.0's together either in code or through a usb bus to send...