I'm in the process of upgrading this midi controller from being a clunky art piece that required Arduino and popcorn serial midi converter to a much nicer instrument, a Livid Instrument. I have had a brain for awhile and to get the 19 buttons all to work I need to make a button matrix. I'm going to do a 5 (pins1-5)x4(13-16) and not have a 20th button.
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Super cool looking project! I'm not sure I understand your question. There is some voltage across the button circuit. Can you point me to the diagram you are referring to?
Also if you are making a button diode matrix with a brain v1, the most efficient way is to always have 8 rows. So you may want to do a 3 column 8 row matrix.
The brain will be sending voltages through the columns. It rapidly pulses each of columns with a voltage then checks the rows to see if the button is pressed or not.
Mark thanks again. I confirmed my work flow using a bread board and will solder it all up tomorrow. In 2 weeks will be setting up the below sculpture (work in progress) at What The Festival and creating an interactive display that you can read more about here.
Super cool,
Can't wait to see some footage from What the Fest. :)
Good luck!