From Thomas Henry's description of the LFO:

The LFO Controller is a versatile analog synthesizer module used to alter audio frequencies, create repetitive patterns, do tremolo effects, and so forth. As an LFO (low frequency oscillator), it puts out control signals such as a sine, triangle, square, gate and trigger in the range of about 0.03Hz to 30Hz. It can also be accurately controlled by keyboard gate or trigger signals to create such effects as delayed vibrato, repetitive envelopes, etc.

This module operates in four basic modes:

• Triggered or delayed mode
• Gated mode
• Footswitch mode
• Free-running mode

In triggered mode, as long as keyboard triggers are appearing, the LFO is quiescent. When the triggers eventually stop, the output signal smoothly ramps up to full amplitude but only after a desired interval. This creates the so-called delayed vibrato effect when used to frequency modulate a VCO (voltage controlled oscillator).

In gated mode the LFO is quiescent as long as no keyboard gates are present. But when a gate is finally detected, again the output ramps up.

Footswitch mode is similar, but now it is an ordinary short-to-ground footswitch which enables or disables the LFO.

Finally, with neither a keyboard trigger nor gate present, the unit behaves as a standard freerunning LFO.

All in all, with these basic modes, in addition to a variety of panel knobs, switches and jacks there is hardly a synthesizer control task that can’t be accommodated. Experimentation will probably uncover other valuable uses