Singer XL-580 Instruction Manual page 34

6. TWIN NEEDLE SAFETY
When using twin needles, press the twin needle safety button
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the stitch width automatically and save broken needles and
possible damage to your machine.
automatically skips all stitches that are not suitable for twin
needle, and a beep will sound when selecting buttonhole
pattern with the direct selection button, indicating that
buttonholes cannot be sewn with twin needle.
7. THREAD CUTTING MODE
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Press this button to activate Thread Cutting Mode. The
machine will automatically cut the top and bobbin thread every
to the button is lit.
8. THREAD TENSION CONTROL BUTTON
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Press - to decrease and + to increase thread tension. While
pressing the button, thread tension adjustment mode is
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