The open-ended architecture of eurorack synthesizers make them very capable of processing live instruments in all kinds of exciting new ways. However, this open-ended architecture can also be overwhelming for those wanting to get started. With this article from September 2018 I hoped to demystify the concept and offer some ideas for how to get started. I still regularly see people asking about this sort of thing on Reddit and in other forums.
You can check out the article here: https://ask.audio/articles/using-external-instruments-with-modular-synthesizers