Roland GR-640 User Manual page 28

Press [ ] or [ ] to set the number of cutting tests
to perform.
Cutting tests in three locations: Status of the finished product
Cutting test in one location: Status of the finished product
Press [ENTER] to select the setting.
You are returned to the following screen (in this example, three cutting tests
will be performed).
Press [ENTER].
The test pattern is cut.
The position of the blade at the time the button is pressed is the cutting
test start position.
You can use the cursor keys to set the position as desired.