Thanks for this reply. It was very kind from you to take your time to give me an help.
I'm much clear now, soon as I get home I will make some tests.
Do you have any schematic of the potentiometers or something that I can follow to connect the buttons?
Any way, I will try to make this by myself and I will post my schematic and the code for debugging.
Once again, thanks for your help.
PS. I was able to follow the schematic of the 3 leds and make them to work with one IC4051.