First of all you dont need a macro to run Functions and they can be triggered by hotkeys. You will need to add the trigger field SA1 SA2 SA3 to the functions. That way when you press the hotkeys it will run those functions. I have only put one line code in there for you to see which has be fired by your hotkey and there you can enter your desired code.
The scanning part needs to be for your specific needs.
What code do you have in your function 1,2 and 3
The scanning part needs to be for your specific needs.
What code do you have in your function 1,2 and 3