Am responding to the question about the Demora, which inspired me to try out some internal feedback patching within the module.
Bearing in mind that these are discontinued (you could get them cheap a while back which is how I got mine); the units are actually pretty flexible but the internal routing is idiosyncratic to say the least. Plus it drains a lot of power. But it’s also a USB audio interface.
The upshot is that you can patch internal feedback, but to maintain an external dry/wet control, you need to use a load of internal crossfaders (I won’t go into details as to why), so there isn’t the opportunity to add loads of stuff to the feedback loop, maybe a filter and a distortion. But having got it all working, it sounds pretty good to my ears. So thanks for the question…