Analogue Systems RS80 LFO

LFO module

Not all periodic oscillations lie within the range of audible frequencies, but this does not mean that you can not hear them. For example, a violinist’s vibrato may take the form of an oscillation at, say, 5Hz, while the growl produced by overblowing a brass instrument may occur at 18Hz. Even in isolation, you may hear a periodic waveform at subsonic frequencies - for example, a clock oscillator with an output of 1Hz will sound like a series of repeating clicks. (Strictly speaking, these have a high bandwidth due to the transient nature of the waveform, and you would not hear a sine wave at the same frequency, but that is not the point.)

Synthesisers have a class of oscillators - Low Frequency Oscillators (LFOs) - that create these, and many other, effects. They can add vibrato to a sound, produce growl, act as low frequency clocks and, on some synthesisers, double as audio frequency oscillators.

The RS80 is a flexible LFOs with extremely low minimum frequencies (one cycle every 50 seconds) that allow you to create a wide variety of modulations and effects. Their maximum frequencies lie in the middle of the audio range so they can be used in three ways: as low frequency modulators; as audio frequency modulators; and as secondary sound sources. It is therefore vital that, just like a primary audio oscillator, they exhibit pitch stability, waveform accuracy, and a lack of unwanted noise and/or distortion. The operation of an LFO may be divided into three major categories: its frequency, its waveform, and its level.

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