Thanks friendos, Arduino leonardo, USB-MIDI, CD74HC4067(error in op)(16:1 mux), would like to split 2 faders, 6 pots, 2 buttons latching, 2 buttons and 4 leds. If I can split these functions on 1 mux I can make 3 modular pieces that can be joined together. This suits me as I can buy parts as I can afford them. I think maybe the leds won't work though as I re-read the post from PieterP.
All of your helpful input is very much appreciated. Very nice guys.
BTW I have made a 12 channel with pots and buttons and it works great, and it was just plug, program and play. This library means someone like myself that will never be able to understand programming can be involved. THANKYOU!