Korg Pa4X User Manual page 497

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
Deleting all the samples, multisamples and drum samples
▪
Select the All Samples, Multisamples, Drum Samples
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.
Making new sounds with Sampling |483
option, and touch OK to confirm.
option, and touch OK