What option is there for pedals and injection boxes?

[hans1966]

Hello Guys, I have a technical question and it is the following.

What is the best pedal configuration and injection boxes to be able to give stability and balance to the sound of two keyboards at the same time in concert.
(Korg Pa4x76 and Nord Stage 3)

What I want to achieve basically is:
1. stability with injection boxes
2. turn up the volume with a Booster, and
3. flesh out the sound with a compressor.

I thank you very much for the help or suggestion to this concern