Well, can ya?

Yes you can.Go to the trim screen and select zone edit.select the part of the sample you want to reverse and then prepare to edit it .A screen will pop up reading some thing like new sound sound 001z. Turn the wheel to the right untill you find the reverse sound and then press do it. The sound has been reversed.

*bows down to bigskee*

thank you sir. You are a gentleman and a scholar