I've had an error with BGT-weidu (I'm pretty sure) and am looking for input... everything was fine but at the final battle of BG1 instead of the final battle music tavern music played... any ideas why?

If the music is the only problem you've experienced, and you can transition into BG2, then just enjoy the very minor bug.

You might want to post at the forum at Spellhold Studios, however, and post the contents of your WeiDU.log file. They'll have a better chance of finding the culprit there.