How do I sync old audio with a new drumbeat?

Hello,

ncurtis has just posted in the Logic 9 forum of Logic Users Group under the title of How do I sync old audio with a new drumbeat?.

This thread is located at http://www.logic-users-group.com/forums/showthread.php?t=5713

Here is the message that has just been posted:
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Hello,

I've imported some .aiff files into the arrange window which are from a Yamaha AW4416 project. I want to do the drums again using Superior Drummer. all the aiff files are lined up in sync but I obviously need the drums to be.
How do I go about doing this? 

I'm guessing:

I tried bpm counter to get a tempo. This altered from bass guitar to guitar ?????
Lining up the pre-recorded audio with the superior drummer was done by eye. Can't be right!
Is this a beat mapping thing????

Hellllllppppppp!!!!
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