The building blocks to sound design. The behringer system 55 921 voltage controlled oscillator is a versatile vco module for the eurorack format. The behringer 921 voltage controlled oscillator is the perfect starting point for sound designers. With six various waveforms to choose from you can generate a wide range of tones using the onboard controls. The module offers both frequency and range controls allowing you to affect the overall timbre of the sounds. It also features rectangular width and clamping point controls for added flexibility. Get in depth with your sound creation by using the wide range of connections including 6 separate audio outputs 5 cv inputs and 2 trigger inputs. With 8 controls and switches you can truly get hands on when it comes to creating music.