Trying to find out what the difference would be between an MM tune and an ML tune shock on the same bike..
My current shock is an MM Vivid Air, the Vivid coil shock I’m looking at is an ML (red M, blue L) – thinking of getting coil for Whistler).
I guess the red M is medium rebound tune, the blue L is low compression tune?

Any info would be great as I’m struggling to find anything useful.

you’re correct Medium rebound tune, low compression tune.