Maybe the X-Touch Mini.
https://www.amazon.com/Behringer-X-T.../dp/B013JLZCLS
I've just ordered one of these. I think you can chain them together. They great thing about this controller is that it has continuous encoders, so you won't have to worry about jumps or finding the spot you left a parameter, when mixing. It also has more than one channel, so you can change the setup with touch of a button.