Exp for all actors

I am trying to get all the actors of my game to receive exp regardless if they are in party or not. The idea is to when a certain actor is in battle, other specific actors that aren't in the party get the same exp and they do.

I have tried to edit the gainExp code but it only gives exp for all the members in party. Is there any way to give it to all actors in game or to give it for the ones that aren't in party?

[mod]I am moving this to MV Support, as this does not require any alteration to any plugin, as it is available straight from the Editor.[/mod]
Go to the Systems tab in the database.
To right section - check the box "EXP for Reserve Members".

That gives the same EXP to all characters who have joined the party.

When you say "all actors in game" how is that different from "the ones that aren't in the party"? If you mean give exp to those who haven't joined the party yet, it can't be done. However, using a variable you give the exp of, say, actor 1 to those actors at the time of joining so that they come in at precisely the same level.

if you mean actors that have not yet joined the party - no, you can't do that because for the game those actors do not exist.
However, there is an easy way to do it slightly differently:
on the event where the new actor is added to the party, you use control variable to get the current XP of an actor already in the party and then change EXP on the new actor with that result.