Really a matter of users function. Something easy to remember, basic needs, etc.
Red/Ora emergency button is dedicated on many radios or limited programming.
Volume min/max levels as needed for its use.
Channel selector, mine set for TGs, can select zones or systems.
Switches are somewhat variable, my toggle is undefined, concentric is TX inhibit.
Side button 1 is my backlight (both modes)
#2 is my scan (both modes)
#3 is monitor for conventional analog mode
Menu * is my clock,, ** battery, *** mute alert tones
Home-self explanatory
Nav for menu functions
Everything else is unassigned.
The radio set up for P25p1 NAS scanning.
73s