I could see this being an interesting playground for processing external audio, using the different channels of Quart to modulate parameters on the filter and the Deflector Shield and then crossfading those outputs with dry. The Horologic Uter is not really usable in this configuration, but everything else would have some utility. I think I would add in another modulation source with some CV inputs and then you could really have fun with some feedback/cross modulation of CV. You could use the crossfader to do some fun audio feedback too. A small system like this can really force you to get creative with the ways you patch to get interesting things out of it. Of course, I'm saying all this as someone with a box of modules collecting dust, waiting for their chance to get swapped in my main case : )
I'd certainly recommend patching it up and having fun with it before selling anything