Sample Rate Madness : What Did I do This Time?

I typically record at 24/48, but last week I had to mix an old project that was originally recorded at 24/44.1. I had some problems switching to and from 44.1 and 48k, probably due to my M-Audio Lightbridge, which seems a little buggy at time. It's clocked over lightpipe by the master, hd24XR, which is also set to match.
Problem:
I changed the autload to 44.1 while mixing the project, it made the devices more stable not having to change back and forth. I forgot to change the autoload back, and recorded a new project today. Both the XR and Lightbridge were set properly to 48k.
I didn't discover my error until the session was 2/3 done, but I had gone back and forth about whether the audio didn't sound quite the same on playback. It seemed a little clearer when I was tracking, as I was probably listening to D/A at 48k. When I checked the files, they were at 44.1. Its nice that I noticed the difference, but I messed up. oops...
Question:
Where did the conversion from 48 to 44.1 take place? The XR said 48, and the Lightbridge said 48 on both the hardware and software control panel. Did Logic automatically down-convert? Or, please tell me no, the M-Audio Lightbridge?
Thanks guys!

Hi Ryan,
Do you think it would sound any different if I changed the headers?
Changing the header will not alter the samples/audio data of the files. What you do is change it to the actual sample rate (WC) used when the recording took place, when it presently states the old session sample rate - you then change your session sample rate.
Whats the quickest way to change them all?
As always make backups. I don't know what you have for software (beyond Logic, WaveBurner, iTunes...) there is a free utility called soundhack which should take care of this in minutes - ( I don't know how many you have ).
So, you change the SR for all files then reopen the session.
J

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