Apple Logic Pro /LogicExpress Discussion

Hi

I think I was once shown a way to match the tempo when adding a new audio file
to an
existing project. Right now I am fighting with Recycle and find it not
cooperating when
preparing an audio file to be placed in an on-going song. Is there a way of
setting Logic so
that once I have a project going on I can bring in a piece of audio and adjust
it without
screwing up the tempo of an existing project?

Thanks in advance
A_Vancouver