Roland GR-640 User Manual page 312

Setting the Displayed Unit
The unit used in messages on the display can be selected.
Procedure
Make sure the material is loaded in the machine.
Press [MENU] several times to display the screen
shown in the figure.
Press [ ] several times to display the screen
shown in the figure.
Press the [ ] key, the [ ] key, and then press the
[ ] key.
The screen shown in the figure below is displayed.
Use [ ] and [ ] to select the unit.
It is possible to select millimeters or inches.