Thanks for sharing the video, I hadn’t seen it.
I’ve also been thinking of putting together a dj system with the modular, but based on feeding stems from a laptop via an ES8. Using an STS is interesting, but has a lot of drawbacks as well (mono only, no way to cue, no way to browse a big selection of tracks). The main things holding me back is cost, and the ergonomics of eurorack: a proper dj mixer is about the same size as a 6U 84HP, fitting all that functionality into a smaller space means big sacrifices in usability. What I’ll probably end up doing instead is adding a four channel effects rig to my existing laptop and dj mixer setup.