I've a Taylor big baby, which started to feed back quite badly yesterday when I plugged it in to my mBox to record. I figured I needed to get the battery changed, but I took it in to my guitar shop to have a technician look at it anyway incase it was a problem with my jack.

The technician looked at it, and we agreed just to replace the battery as everything looked fine. I changed my strings and plugged it in to my amp and it sounded fine. Now I'm trying to record with it, and it's far too bassy. It sounds completely different to my previous recordings. I can put an EQ on the channel to raise the high frequency, but it just increases the background noise while it does so.

I don't know if I'm just being really dim as I've been editing for weeks and can't see the woods from the trees, but here's an example of what I mean:

http://www.mediafire.com/?cq30c7wz466rp3n

I've a feeling the mic may have been moved or something, but the levels and everything are the same, but even when I adjust them, the sound is still very muffled and has too little treble. The input is totally different now?