Thanks for your contribution Luigia.
Here I see a few interesting diversions I will certainly explore.
the idea is to expand the setup over time.
Music is my (potentially bank-breaking) hobby, therefore even if it probably wise to think bigger from the beginning as you suggest, I am not in a rush and can consider the direction I want to take while I am on my way.
I will take some time to analyse the info I have so far and see what I come up with (When I was talking about equalising white noise I had in mind something with individual outputs which I could mix with an external mixer....you really hit the nail with that)

Thanks
F