A Low Frequency Oscillator. It is similar to a normal oscillator except that it outputs very low frequencies (very slow waves) and is used as a control input into another part of the synth. Examples of its use are to create vibrato or tremolo effects....
VCS3
Very early VCS3 (pre-Putney), note Oscillator 1
The original portable synthesizer introduced in 1969 had a solid Aformosia cabinet
which housed the following modules interconnected by means of a matrix patchboard.
3 x Voltage Controlled Oscillators.
Noise Generator.
2 x Input Amplifiers.
Ring Modulator.
Voltage Controlled Low Pass Filter.
Trapezoid Envelope Generator.
Voltage Controlled Reverberation.
Meter.
2 x Stereo Output Amplifiers.
Joystick.
The VCS3 had:3 Voltage Controlled Oscillators, a Noise Generator, 2 Input Amplifiers, 1
Ring Modulator,1 Voltage Controlled Low Pass Filter,1 Trapezoid Envelope Generator,
a Voltage Controlled Reverberation unit, 2 Stereo Output Amplifiers and a Joystick.
Routing the various functions of the instrument was done via a small pin patchboard.