Brother MFC-3240C - Manual (Page 163)

USING YOUR MACHINE WITH A MACINTOSH ® 8 - 41
COPY
The Copy buttons (1-4) can be customized to allow you to take
advantage of the features built into the Brother printer drivers to do
advanced copy functions such as N-in-1 printing.
Before you can use the Copy buttons you must first configure the
printer driver by clicking on the button while holding down the Ctrl
key.
You can enter up to a 30 character name in the Name for Copy field
and select Copy Ratio.
You can select the Resolution, Scan Type, Document Size,
Brightness and Contrast settings to be used.