more than 12 channels

[dan]

Yes, If you take out the 7 from line 55 you can use the rest of the pins in the list.

You will also need to change the wires for stations 8 - 12 to match the new numbering.

Or I think you could just move the wire from pin 7 to e.g. pin 29 and replace the 7 on line 55 with 29. You would also need to remove the other 29 on line 55. That way you would only need to move one wire.

There is a helpful pin diagram for the Pi:
https://pinout.xyz/#

Dan