Well, even if the improvements stop now, I'd be happy Vinnie! Just picking a random song like I did this morning turned up 3 concrete instances where the sound made me smile in comparison to the Nano line-out.
How the heck do you design circuits around caps that take so long to burn-in? Do you do it on paper and have faith it'll turn out ok, or do you keep a pile of burned-in reference caps to prototype with? I'd love to understand what transformation the capacitor goes through, but I guess that's all about the molecular makeup of the dielectric..
Doug