Native Instruments MASCHINE MK3 Groove Production Studio (Black) - Manual (Page 274)

Control Description
Import All Banks Select this to import all Banks of the MPC Program file. Each
Bank will be loaded into a separate Group.
Import One Bank Select this if you only want to import a single Bank. Use the
drop-down menu to the right to select which Bank you want to
import. The list below shows you a preview of the sounds in the
selected MPC Bank.
Managing Sounds, Groups, and Your Project
Importing Third-Party File Formats
MASCHINE - Manual - 274