The human version was called "dual-classing." In 1E, "multi-class" meant the demi-human kind.Woah, pardner. You're talking about demi-human multiclassing (as opposed to the human, character with two classes).
No, but dnd4vr specified how proficiency bonus was handled in their 5E version.First, there were no proficiency bonuses in 1e based upon level of class.
Yeah, I didn't feel like it was necessary to get into all the hairy details. Nothing was ever simple in 1E.Second, there were a lot weird rules; for example, a F/Mu was not constrained by the MU's armor and weapons, but if you multiclassed with Thief, you were constrained by the Thief's constraints ... for REASONS! (p. 18, PHB).

True. This was part of 1E's "balance across the level range" principle: Being a powerhouse at low levels was balanced by suckitude at high levels and vice versa. If your campaign ran long enough to hit the cap, you would be a sad panda. Even if (as was common) the DM waived the cap, multiclassed PCs would fall behind once the XP table stopped being exponential and turned into a flat amount per level.LEVEL LIMITS. Yeah, this was a bummer- when you hit your level limit, you kept putting XP in that class, and you couldn't advance.
Unfortunately, "balance across the level range" presumes that the typical campaign runs from 1st level into the teens, and that has never been the case, then or now.
Not exactly gestalt, but the basic idea was the same: You advance simultaneously in two classes and meld their abilities, rather than advancing in each class separately. 4E did something similar with hybrid multiclassing. (I quite liked the 4E hybrid rules--I played a wizard/lazylord who was great fun--but I guess they never really caught on.)Lots of weirdness- not gestalt, I don't think.
I've sometimes thought about trying to re-create the hybrid rules for 5E. I think it would be doable, although the lack of a unified class framework would make it a bit trickier. Basically cut all usage limits and spell slots in half, and then figure out how to handle the at-will abilities like Extra Attack and Sneak Attack.
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