How do I control the sewing speed on the XH2135-001?
Press the foot controller down to start sewing and take your foot off the foot controller to stop sewing. Pressing harder on the foot controller increases speed, while releasing pressure slows the machine down. Do not turn on the machine while pressing the foot controller down, as this may cause unexpected movement and injury. (Page 1)
From the official Brother XH2135-001 Computerized Sewing Machine manual, page 1
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