Hi!
First of all, I came here in search of a solution just like you.
I'm still researching and planning my approach.
My goal is to run RuneAudio and PiHole on the same RaspberryPi.
But let's try to find a solution together!!
uname -m gives you the machine hardware name -> ARM 7, that's the CPU
This Website says its a stripped down linux.. whatever that means.
In your shell on the RPI run the following commands to find out what RuneAudio is based on.
more /etc/*-release (if its there)
lsb_release -a
hostnamectl
uname -o (should give the OS, but no details, might be just: GNU/Linux)
post the output you get!