I have modified TK’s floorboard project for use with
Line6 POD2.
It can be found for anyone interested http://obs.multiplayer.gr/podfloor.zip
Note that the code is not optimized since it’s my first time with assembly, but it works.
The changes are the following:
Hardware Modification
o    Each one of buttons 5,6,7 and 8 shown on the schematic are replaced
   with a LED and a 220ohm resistor in series that are used as led indicators of currently
   selected button.
o    Buttons 9 and 0 are optional.
Software Modification
o    The 7 segment display now shows a number for the POD bank (1-9) and a letter (abcd)
   for the    selected channel making it possile to select from 1A to 9D.
o    Button 0 transmits a Program Change #37 to put POD in Tuner mode.
o    Button 9 transmits to CC#64 a value of 127 which is the tap-tempo signal.
o    PORTB[0..3] are now used as output for the 4 channel leds.
o    When the button whose led is ON is pressed, instead of sending a Program Change,
   the tap tempo signal is sent.