@support: thx.
It's about: letting Buttons#1 and Buttons#2 showing different pages and merging the signals of the two midi controllers as far as i understand now.
The simple configuration in Midipipe might be something simple like seen on screenshot below, where i named a new Pipe on the right 'Merging AKAI & Novation controller' and added two times a Midi In & Midi Out.
I've dedicated the first MIDI Input & Output to my APC Mini and will dedicate the next Mini In & Out to the Novation Launchpad Mini MK2 i will by.
It should work one way or another as i read from some forumers here.