B&K Precision 4040B - Manual - Manual (Page 36)

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F1: Deviation - Defines the FM deviation frequency.
F2: Frequency - Selects the modulation frequency, from
0.1 Hz to 20.00 kHz.
F3: Shape - Selects the shape of the modulating
waveform between Sine, Triangle, or Square. For model
4014B, only Sine is available.
F4: External - Selects and enables the external
modulation by an external signal applied to the
Modulation In connector in the rear panel.
3.7 ON Key
Use this key to control the main output signal. When the
output is active, the ON key will be lit. By default, this will
be ON (enabled) from a power-up. This can be changed
by changing the Out-On Def settings from the UTILITY
menu.
3.8 Cursor Keys
Use these keys to move the cursor (when visible) either
left or right. They are used in conjunction with the rotary
input knob to set the step size of the rotary input knob.