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The CU-1 Tremolo/Off/Chorale Switch from Hammond is a half-moon shaped switch assembly used to control the speeds of the internal digital Leslie found in the XK-3, XK-3C, and SK2 keyboards, as well as the speeds of any Leslie speaker that is connected to the 11-pin Leslie connector found on the XK-3.
This switch assembly mounts to the XK-3 front rail via the two thumbscrews provided and can easily be removed for transportation purposes.