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I can't remember if those focusrite interfaces have balanced inputs or not
The Focusrite 8i6 has six balanced line inputs, and four balanced outputs

for amplification you could use an input module - or if you are not going to use it constantly something like MI Veils is a good buy as it has a lot of gain available, is 4 channels and is a cascading vca so can be used as a mixer - intellijel quad also does this - not many vcas do!
The MI Veils is on my list for my RackBrute 6U build....maybe it moves up the priority list a little? :)

but if you want midi i/o from the modular then befaco make both in and output 4 channel midi modules and are usually pretty good
Thanks for that recommendation!