KORG PA4X 76 - Manual (Page 476)

472| Customizing and editing the Sounds
Use this option with care, since you may delete samples you would like to
preserve, to be later used in new multisamples still to be created.
Deleting all the multisamples
▪ Select the All Multisamples option, and touch OK to confirm.
Deleting all the samples, multisamples and drum samples
▪ Select the All Samples, Multisamples, Drum Samples option, and touch OK
to confirm.
Select this command to delete all samples, multisamples and drum samples
from the RAM memory. This operation completely resets the RAM, and may
be used to clean-up any trouble with memory management.