Roland GR-540 User Manual page 291

Press [ ] twice.
The screen shown in the following figure is displayed. First enter the CROP-L value.
Use [ ] and [ ] to enter the value.
Refer to the section above titled "CROP-L/W Values" to enter the values.
Press [ENTER].
The screen shown in the following figure is displayed.
2. Set the CROP-W value.
Press [ ].
The screen shown in the following figure is displayed. Enter the CROP-W value.