IoT experimentation, midi pipe organ pedals and remote controlled passive XLR summer

Manual routing is not really an option... crosscut something like:

Drilling 3mm (or 5mm) wholes aquidistant in the 'valleys' and then populate -from behind - with cylindric LED with concave coene head (or flat/flattened head and reflective cover head...

            _______
-------.   |\     /|   .-----------
        \  |  \ /  |  /
         \ |       | /
         |\| '___' |/|
---------' | |     | '-------------
         .-' |  |  '-.
         '-----------'
             |  |
             |  |
             |

Alternative option: place the face in a few centimeter deep frame with directed leds with narrow lightning angle flishing the shiny part of the pannel.