I honestly didn't notice any noise issues. I listed to it on headphones and on an MP3 player powering not terribly sensitive computer speakers. I wouldn't have guessed that you had patched it together at all. The overall sound of the recording was maybe a touch dry, but not so much that it was painfully metallic and flat, like when someone overdoes it.

Re McKay: I stopped watching SGA in season 3, in something of a huff, but I've kept reading the fic (what can I say? I have a weakness for AMTDI.) so my picture of McKay may be somewhat fanon-influenced. Your interpretation worked for me. *shrug*