Oscillators are circuits that output a steady tone. If the frequency of this tone can be controlled by an external control voltage it can be called a _voltage controlled oscillator_. The waveform this oscillator outputs makes a difference in timbre and overtones.
Many eurorack oscillators output multiple different waveforms at once. The Input which controls the frequency is sometimes called _1V/Oct_. This describes the sensitivity of the input: a change of 1 Volt in the input changes the output frequency for one Octave.
