Can a cc121 be combined with ...

PS:

I get that some people say they’re fine with 8 channels of faders, but look at what happened with the Behringer X-touch: The “hobby” market loved the price of the unit but immediately asked for more faders. Like, right away. And Behringer complied. Behringer is the type of company that can produce those things quickly and cheaply and are willing to do so (because they “rip-off” existing tech rather than design completely from scratch) so they did. Users loved it.

So even if we get what we want but only 8 channels users will start asking for more channels right away…