Without looking at the vehicle it would be hard to determine what the problem is. I would recommend that you drive with the technician so that they are hearing the same noise as you are.
Once they know what you're talking about, it should be easier for them to locate the problem.
Because you're hearing it during acceleration it could be related to the belts, pulleys or even the wheels spinning. Again, it's hard to tell without hearing it. Good luck.
〉 Answered on Feb 14th, 2008 by Lori Johnson, Owner and Instructor at Ladies Start Your Engines