Not eurorack, but a digitakt, 404, boss looper or anything like that would really stretch that system out and make your techno/ambient goals way, way easier. That way you can record your different patches for different parts, drums, bass, padding then live sequence melodies and tweaking them. Some can sequence so you can just toss in a midi module. Also gives you effects. Also very cost effective, especially if you get mk1 versions second-hand

Suck it, nerd