Scott Riesterer takes a look at the Befaco Instrument Interface. This is an input module which allows you to connect microphones, synths, drum machines, electric guitars and basses to your modular synth. Additionally, it provides a number of CV outputs and controls to allow you to use these input signals to dynamically control your patches. He provides a few examples of how you can put it to use.
There's lots to love about the Befaco Instrument Interface and Scott does a great job of showing a lot of what this module is capable of.
Learn more about the Befaco Instrument Interface here: http://www.befaco.org/i4-instrument-interface/
Learn more about eurorack synths and sysnthesis: https://ask.audio/academy?nleloc=category/audio/topic/eurorackmodular