I've been working in Auria a solid number of hours per day for the past month-and-a-half...and really enjoying it. (I'm hoping to post a New User's Thoughts thing in the near future.) Just to say: the DAWs I've primarily used over the past ten years are Live and Cubase.
So:
Joining Segments *always* leaves the resulting join quieter. I have tried everything I could think of from turning the auto-xfade off, removing DC off selected or all segs, and even bypassing fx (wondering if the join was accidentally bouncing with a compressor on). Always a quieter result. Every split/joined segment has been from the same take on the same track with reasonably similar amplitudes.
Splitting: I've looked high and low on this and can't find anything--and I hafta be missing something, here. When I split a track (into a note or 40 bar section)--and then want to "heal" it back to normal when I'm done editing, I have to slightly cross fade/overlap the original and unedited segment back into itself before Joining. Otherwise, there's a very audible click (like a mismatched zero-crossing)...though DC removal doesn't fix it. I've never worked with a DAW that's made me work this hard to split/slice/cut, and then re-join. As I said--I must be missing something!

Anyone with ideas? Much appreciated in advance.
Nick