921A Oscillator Driver

Behringer 921A

The Behringer 921A Oscillator Driver is used to control the 921B oscillator, providing precision pitch control and adjustment of the pulse width of the rectangular waveform. It allows you to offset an incoming voltage with a dedicated knob, which can be tuned to ranges more suitable for pitch shift in the range of semitones or in the range of octaves (though the offset knob itself is continuous, and does not produce stepped values). The transposition goes up or down by 12 semitones or six octaves from the base frequency, depending on the selected mode. The other control sets the pulse width of the rectangular waveform, and goes from 10-90% pulse width. It also allows for CV control over the pulse width for creating crushingly huge PWM effects. This module is intended to be used with the 921B oscillator in order to provide an additional level of control.

921A Features

• Precision adder and pulse width control
• Intended for use with 921B oscillator
• Offset an incoming voltage by +/- 12 semitones or +/- 6 octaves
• Manual and CV control of pulse width