Oakley Quad VCO Panel
VCO1 is a version 1 and all the others are version 2. The version 1 has part of the tuning reference coming from the +15V rail which is chaged to a proper reference on the version 2s. Pitch CV input toVCO1 is fed via the switched inputs to all subsequent modules unless they have their own pitch CV inserted. This saves using a split in many situations where all four oscillators need to be at the same basic pitch.