I'm not sure if this is a plugin specific thing, or a system-wide modification, but there are a fair few situations in which hitting a plugin causes a digital click. If there's a delay or reverb after the click, it gets amplified and repeated (which I guess means we know it's happening at that point in the signal path, rather than just as a computer glitch affecting the outputs...)
Is this a known thing that's being worked on? It's not crippling, and for the most part, it only happens if there's audio going through the plugin at the time but it's making a few of the more experimental things I'm trying to get the Duo to do difficult to use...
On a related note (positively) I've been doing a lot of very detailed listening/testing over the last few days, both performance wise and listening to recordings, and the basic fidelity level of the box is wonderful. I can't wait to see the plugin set mature and grow - it's extraordinary just as it is, but it'll be unbeatable soon
I've been spending about 6 hours a day programming and tweaking sounds... exciting times!