multiclass multiboxing is there any generic tips for running multiple classes in a multibox setting?

I find it easy to multibox one class, but when i add another class i am totally confused as to how to appropriately use the odd man out.

example i have a 4 man team of locks been leveling them just fine and easy. but i want to add a shaman/priest to the mix. ( until i get to higher lvls and can use my primary account lower lvl alts. lvl30-50)

the locks so far kill everything in one volley except in instances (rfc was just hell on me 5 at once i had issues with). I want to add an enhancement shamon lvl 20 to the party.

how should i setup that shaman? should the odd man out be the main controlled class? how about if you have a party of 5 different classes? how do you multi those? how do you handle say melee class with 4 caster class? like tank/caster setup.

I think i just need some generic tips on how to play with a different class in the group of locks. any stickies out there that i am missing on this topic?

Thanks
War

im not 100% sure but i think some ppl use keypad (or a keypad-like thingy that has USB plug in so its like a 2nd keyboard almost) to control the odd one out. dont take my word for it tho i could be wrong after all i do all same class myself :P hope this helps