Today I received my digiamp+, installation was very simple.
I have been playing with the onboard (crappy) audio interface for a couple of days and at this moment I listening to my music using this amp and my Spirit Absolute Zeros’s.
Pfff, so much better!
Next steps, a better power supply and a case for the package, embed the rotary encoder for volume control.
My “ultimate” thought, put a 7" touch screen on the Pi and control the Roon core with it 
Just the basic things, select album, start/stop playback, next song and probably some volume control.
Guess I need some more reading of the community here
Picoreplayer will do it and will feed your screen using Jivelite extension.Easy as …
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But you can’t control roon with the RPi screen, but can display perhaps vu’s I also want to try this on my similar setup with iqaudio digiamp
I am also not searching for full control but just do some basic things, I guess the API from Roon can provide me with a solution for most requirements, no I “just” need to learn how to use the API 
You can control some functions but I use my Roon Controller on the IPad anyway.if you use LMS installed on the Pi you can control more.