MAME key binding question

[jimmy2x2x]

when mame is running, open tab menu, select control to modify

and I want to ADD a key to the existing bound keys, not overwrite it

pretty sure you can do it, cant remember how

[BobA]

You hit enter to change the key.  The next key you hit will be assigned. If you hit enter again you can add a key to the one you first put in.  If you hit enter again you can add a third key.   If you mess up just exit the menu and come back and hit enter and you will be able to add a single key again.

[jimmy2x2x]

Thank you Mr.Fett