The adjustment key is used to adjust the thread feed or the machine speed.
increases the machine speed (stitches per minute)
decreases the machine speed (stitches per minute)
toggles the safety grabber in and out (for needle threading access)
Pressing these buttons on any machine will start all machines in a Flex cluster. Pressing the Start button only on one machine will start that machine.
Pressing these buttons on one machine will bring all other heads in the Flex cluster to the XY position of that machine.