If you want to process external sounds, I would recommend an input module that includes an envelope follower (so that the incoming sound also produces a control voltage that triggers other things in the system). Doepfer makes an inexpensive one, but I didn't care for that one, so I use a Future Sound Systems TG5 which is killer. I do love the Doepfer spring reverb though. In fact, I recently weighed the pros and cons of the Erica, Intellijel, and Doepfer spring reverbs, and decided that the Doepfer was the best option for me. Finally, you may want to check out the Soma Lyra FX module for deep, dark delays. Seems like it might be valuable for the sounds you are trying to make.
Have fun and good luck.
-- farkas
Thanks Farkas, I wil have a look at the other spring reverb units. I realy love to use them as a feedback soundsource. The idea to have the input sounds as triggers sounds very interesting! Hahaha I played with the Soma Lyra a while ago and almost bought one, I realy loved it but decided to save my gear budget for my modular built and now you tell me that I can have the Lyra effects in my modular! these are the tips I am looking for🥳.