I’m loving it so far, but it’s pretty confusing and weird, which is exactly why I love this system. That’s weird that it was DOA, sorry to hear that.
Mainly so far I’m using the Leibniz system’s DAC output to sequence the pitch of the Mangrove. Otherwise in this little case, it’s pretty thin sequencing options. What I’m discovering very quickly though, which I knew to some degree, is that it doesn’t take a very complex signal in the ADC Input to really get some interesting results. Right now I’m just using a sine wave LFO and then mangling it through the Leibniz. I thought I’d need/want more complex input from the Batumi/Samara/Cold Mac, but those modules may be considerably more freed up to modulate the Mangrove/Sisters/JF if I use the Dixie as just a simple CV source for the Drezno. Just Friends is just meant for envelope generation, but the outputs of the Leibniz are great for the Strike input of the Optomix. I had a Koma dual VCA in an earlier iteration to have 4 rather than 2 voices possible, but I’m enjoying fewer voices but more complex modulation of those voices in the output.
I do wish there was more documentation and video on the system, but that’d also take a bit of the mystery out of it too and I enjoy feeling like some weird alchemist in a medieval lab to some degree sometimes 
Anyway, I love this stuff but it definitely would be a tough system to harness if you’re looking for fine-tuned control. Most people seem to prefer more straightforward sequencing approaches I think and that’s why this XAOC system hasn’t caught on perhaps.