Kurzweil Forte - Display Brightness Knob; Kb3 Led

Features of the Forte
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Display Brightness Knob
You can adjust the display brightness by turning this small knob.
KB3 LED
The KB3 LED is on the right side of the Assignable Switches.
If the currently selected Program is a KB3 program, the KB3 button’s blue LED is lit. This
indicates that the front panel KB3 controls (printed in blue) are active.