This information applies Analog Rytm, Analog Four, Analog Keys, Digitakt, Digitone, Digitone Keys. The screens look a little different depending on which unit you are using, but the steps are the same.
Access the global settings menu by pressing the cogwheel button (Digitakt, Digitone/Keys, Analog Four MKII, Analog Rytm MKII), Function + Track (Analog Rytm MKI), Function + Song (Analog Keys), Function + Keyboard C2 (Analog Four MKI).
In the global settings menu, select SYSTEM
In the SYSTEM submenu, select FORMAT +DRIVE
In the FORMAT +DRIVE submenu, select which items you want to format and then choose to ERASE SELECTED DATA
PROJECTS+SOUNDS is available on all machines and will remove sounds and projects created by the user, factory sounds, and the factory preset project.
SAMPLES is only available on Analog Rytm and Digitakt and will remove all user items, but the factory samples will remain (the factory samples do not occupy space on the +Drive and cannot be deleted).