I have toured with Pyramid for about 2 years and tried all sorts of combinations for controllers.
The biggest problem I’ve run into is clocks.
So beat step pro, and things like that are out. They send a clock, and unless I want them to be the master, and pyramid the slave (which I don’t) then I have had to move them further down the chain.
At the moment I’ve started using the Arturia Keystep as my main keyboard at the MIDI in
And have a couple of different controllers placed down the chain (for Octatrack mixing, and other fun)
But to be honest, most of the time I tend to just select the track and then play the key pads on the Pyramid.
When I go to the trouble of bringing a controller it’s usually just for a golden moment in a song or two, and it seems silly by the end of the show to take up so much space for something I am not using all the time in my set.
But as long as clocks are either removed, or appropriately assigned, then more than one controller should be ok.