Logic Pro 9 Sample editor functions not working


Question for all. I'm trying to use the sample editor to do specific functions. Somehow when I highlight a sample area or the whole sample itself for editing and go to the functions or factory tabs, not everything is accessible for use. For example, highlight 2 beats of a drum sample, go to function tab, only gain change is bold. All other functions for editing are greyed out. What am I doing wrong? Checked PDF manual and it doesn't say anything other than what the functions do. Can anyone help? Thanks in advance.:)