Hey,
The Bastl Betsie reminded of a friend using no input mixer technique a lot (with stompboxes in the loop). I the sound of feedback, it’s a thing I enjoy a lot in Strega and Lyra-8.
Anyway, it reminded me I have an old Alesis Multimix that could be used to experiment this and sample crazy sounds.
I looked for things to avoid and found the following video that (can be annoying at times but) contains some useful advices like switching off phantom power and using a second mixer for gain staging.
I bet some here have been practicing this for some time… Throw your tracks, tips and tricks here!