Hmm now I'm confused. For some reason this is one of those (many) things I just can't seem to wrap my head around. 

You've got nothing to lose from doing them again even if it's just for peace of mind.

If it was me, I wouldn't be able to stop wondering about it until I redid the measurements. I can't stand having "what ifs" hanging around in the back of my head.

Yeah I know it's fairly easy to do again, but on the other hand I've been so pleased with the results of the first measurements I took that I almost don't want to jinx it. I realize that may sound dumb...
 
Anyway I've asked the question on the IK forum, and if I don't get a satisfactory answer there I'm going to ask IK support. Let's have some more input on this....

sharke
Yeah I know it's fairly easy to do again, but on the other hand I've been so pleased with the results of the first measurements I took that I almost don't want to jinx it. I realize that may sound dumb...
 

that sounds dumb !!  :-D
So...you blew the weekend and didn't do it, eh?  Shame, shame, shame....  You better have recorded some new stuff then....

mixmkr

sharke
Yeah I know it's fairly easy to do again, but on the other hand I've been so pleased with the results of the first measurements I took that I almost don't want to jinx it. I realize that may sound dumb...
 

that sounds dumb !!  :-D
So...you blew the weekend and didn't do it, eh?  Shame, shame, shame....  You better have recorded some new stuff then....

Actually I'm still trying to get to grips with the Babyface...I haven't even worked out how to record into Sonar with it yet, it's a trifle more complicated than my previous box 

Well I got a reply from Obi on the IK forum: 
 
"As long as both were of the same quality (USB/Firewire connection vs built in sound card) it shouldn't be an issue."
 
That's good enough for me 

I guess you are referring to "total mix"? It is a bit intimidating at first. But it's very flexable. Just work with it a bit.
T

I would re-do the measurements and compare the old settings with the new ones.
 
Rocky

i know that all the different interfaces i currently have, or have previously used, have a different sonic fingerprint...
 
my guess is, that there are minor differences in the way that mic is translated thru each interface.
 
it'd be a cool experiment to just SEE
if any changes are made......