io = ((ioport.ports[":IN.0"]:read())&0x18) >> 3
or maybe / 8 if LUA can't do shifts

Then
if io == 0:
do sequence: 0, 1, 3, 2, 0

or if io == 1:
do sequence: 1, 3, 2, 0, 1

and so on

Also, in case the user has put it into the Options menu already, start the menu dial with ready, then go to options.