My guess is that whatever the bass player used to play back and record a synced track to was running at a slightly different time base.
If that's the case you can edit the bass track by using the time stretch function of your editing program. You'll have to adjust the starting sync point first then go to the end and figure out exactly how much you need to stretch the track so the start and end will both sync up. You can find directions to do the actual stretch in the program help files. It's usually a matter of selecting the stretch audio length function and entering in the number of milliseconds that it needs corrected by.
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