hi
im making my own MIDI controller and im going to have a drum pad section. for that im going to use this breakout PCB: https://www.sparkfun.com/products/8033 and then im going to put some 4x4 buttons on that (+ RGB LEDs) then i want to connect that to the brain jr from livid instruments: http://shop.lividinstruments.com/brain-jr/. the thing is that i dont know if the brain jr can handle the breakout PCB (with the buttons and LEDs) and a few more buttons, potentiometers, LEDs and stepped encoders (these are directly connected to the brain).
(note: the brain is only supposed to have 16 buttons/switches tops but i dont know if by adding the breakout PCB can allow me to put even more)
if it can handle it, it would be great if someone could tell me how to connect the breakout PCB to the brain jr.
any help will be great

thanks