Pardon my ignorance, but how does the output of a modular setup differ from the output of a normal hardware monosynth? People have been plugging those straight into audio interfaces in home studios for as long as digital conversion has been with us, and you just watch your levels since its obviously much hotter than other sources (like a dynamic microphone or a bass guitar).
Some electronic artists even run their synths thru outboard preamps just for punch / warmth / grit in the studio, even though amplification is not needed and that could probably compound the problem of a really hot signal.